Free exam prep for UPSC CGS Mains Exam and State Exams with Online tests, Sample papers, Videos, Notes, Mock Pdf & more only on Notopedia.

EXAM SYLLABUS

The UPSC Civil Services syllabus is distinct for the Prelims and Mains stages. With the UPSC 2026 Prelims exam date announced, aspirants should thoroughly review the complete syllabus and plan their preparation in a structured and focused manner.

The detailed syllabus of UPSC CGS Mains Examination is given below:-

Stream-I: Scientist ‘B’ (Hydrogeology)

Stream-II: Scientist ‘B’ (Geophysics)

EXAM SYLLABUS

The UPSC Civil Services syllabus is distinct for the Prelims and Mains stages. With the UPSC 2026 Prelims exam date announced, aspirants should thoroughly review the complete syllabus and plan their preparation in a structured and focused manner.

The detailed syllabus of UPSC CGS Mains Examination is given below:-

Stream-I: Scientist ‘B’ (Hydrogeology)

Stream-II: Scientist ‘B’ (Geophysics)

Stream-III: Chemist & Scientist ‘B’ (Chemical)

EXAM PATTERN

The Mains Examination for UPSC Geo-Scientist shall be held as a Descriptive Type Test. The mains examination is divided into three Papers in each stream each paper containing 200 marks. The maximum marks for each stream is 600 for which a time of 3 hours will be provided for each Paper.

Stream-I: Scientist ‘B’ (Hydrogeology)

Stream-II: Scientist ‘B’ (Geophysics)

Stream-III: Chemist & Scientist ‘B’ (Chemical)

Mod of Examination

The mains examination will contain three Conventional type papers. The papers will be Descriptive in nature and will be held through offline mode.

Medium of Examination

Conventional type papers must be answered in English only. Question paper will be set in English only.

EXAM PATTERN

The Mains Examination for UPSC Geo-Scientist shall be held as a Descriptive Type Test. The mains examination is divided into three Papers in each stream each paper containing 200 marks. The maximum marks for each stream is 600 for which a time of 3 hours will be provided for each Paper.

Stream-I: Scientist ‘B’ (Hydrogeology)

Stream-II: Scientist ‘B’ (Geophysics)

Stream-III: Chemist & Scientist ‘B’ (Chemical)

Mod of Examination

The mains examination will contain three Conventional type papers. The papers will be Descriptive in nature and will be held through offline mode.

Medium of Examination

Conventional type papers must be answered in English only. Question paper will be set in English only.

Marking Scheme

There will be no negative marking in conventional type papers.

Personality Test / Interview

1. Stage III will consist of Personality Test/Interview carrying 200 Marks (with no minimum qualifying marks).

2. Candidates, who obtain such minimum qualifying marks in Stage II as may be fixed by the Commission as per its discretion, shall be summoned for Stage III (Personality Test).

3. The number of candidates to be summoned for the Personality Test will be about twice the number of vacancies to be filled.

4. In the Personality Test, the candidate will be interviewed by Board i.e. Interview Board (s) constituted by the Commission. The object of the interview will be to assess the suitability for the post(s) of Chemist, Scientist ‘B’(Hydrogeology), Scientist ‘B’(Chemical), and Scientist ‘B’ (Geophysics).

5. Special attention will be paid in the Personality Test to assess the candidate’s capacity for leadership, initiative, and intellectual curiosity, tact and other social qualities, mental and physical energy powers of practical application, the integrity of character, and aptitude for adapting themselves to the field life.

ELIGIBILITY CRITERIA

Candidates willing to apply for UPSC Combined Geo-Scientist are required to fulfil certain conditions to be eligible for it. The candidate who does not satisfy the Eligibility criteria like Age, Minimum educational qualification etc., their candidature shall be rejected by the authorities. The criteria for eligibility UPSC Combined Geo-Scientist are decided by the conduction body itself. The candidate’s eligibility for UPSC Combined Geo-Scientist Examination is based on the fulfilment of the following conditions:-

1. Nationality

2. Age Limit & Relaxations

3. Educational Qualifications

Nationality

A candidate must be either:

1. A citizen of India or

2. A subject of Nepal or A subject of Bhutan or

3. A Tibetan refugee who came to India before the 1^st of January 1962 with the intention of permanently settling in India or

4. A person of Indian origin who has migrated from Pakistan, Burma, Sri Lanka, or East African countries of Kenya, Uganda, the United Republic of Tanzania, Zambia, Malawi, Zaire, and Ethiopia or from Vietnam with the intention of permanently settling in India.

Provided that a candidate belongs to categories (2), (3) and (4) above shall be a person in whose favor a certificate of eligibility has been issued by the Government of India.

Age Limits (as on January 1, 2026)

Minimum: 21 years (born not earlier than January 2, 1994).

Maximum: 32 years (born not later than January 1, 2005).

Candidates must meet the age criteria specifically for the posts they apply for (e.g., Group 'A' vs. Group 'B').

Age Relaxations

For government servants

The upper age limit will be relaxable upto a maximum of 7 years in the case of Government servants, if they are employed in a Department mentioned in Column I below and apply for the corresponding post mentioned in column II.

Further Relaxations

Education Qualification

1. For Geologist Group ‘A’ in Geological Survey of India: Master’s degree in Geological Science or Geology or Applied Geology or Geo- Exploration or Mineral Exploration or Engineering Geology or Marine Geology or Earth Science and Resource Management or Oceanography and Coastal Areas Studies or Petroleum Geosciences or Geochemistry from a University incorporated by an Act of the Central or State Legislature in India or an educational institution established by an Act of Parliament or declared to be deemed university under section 3 of the University Grants Commission Act, 1956 (3 of 1956) i.e. recognized University.

2. For Geophysicist Group ‘A’ in Geological Survey of India and Scientist ‘B’ (Geophysics) Group ‘A’ in C.G.W.B.: M.Sc. in Physics or Applied Physics or M.Sc. (Geophysics) or Integrated M.Sc. (Exploration Geophysics) or M.Sc (Applied Geophysics) or M.Sc. (Marine Geophysics) or M.Sc. (Tech.) (Applied Geophysics) from a University incorporated by an Act of Parliament or State Legislature in India or other educational institutes established by an Act of the Parliament or declared to be deemed universities under the University Grants Commission Act, 1956

3. For Chemist Group ‘A’ in Geological Survey of India and Scientist ‘B’ (Chemical) under C.G.W.B.: M. Sc. in Chemistry or Applied Chemistry or Analytical Chemistry from a University incorporated by an Act of Parliament or State Legislature or other educational Institutes established by an Act of the Parliament or declared to be deemed Universities under section 3 of the University Grants Commission Act, 1956 i.e. recognized University.

4. For Scientist ‘B’ (Hydrogeology) Group ‘A’ and Assistant (Hydrogeologist) Group ‘B’ in C.G.W.B.: Master’s degree in Geology or applied Geology or Marine Geology or Hydrogeology from a University incorporated by an Act of the Central or State Legislature in India or other educational Institutes established by an act of

ELIGIBILITY CRITERIA

Candidates willing to apply for UPSC Combined Geo-Scientist are required to fulfil certain conditions to be eligible for it. The candidate who does not satisfy the Eligibility criteria like Age, Minimum educational qualification etc., their candidature shall be rejected by the authorities. The criteria for eligibility UPSC Combined Geo-Scientist are decided by the conduction body itself. The candidate’s eligibility for UPSC Combined Geo-Scientist Examination is based on the fulfilment of the following conditions:-

1. Nationality

2. Age Limit & Relaxations

3. Educational Qualifications

Nationality

A candidate must be either:

1. A citizen of India or

2. A subject of Nepal or A subject of Bhutan or

3. A Tibetan refugee who came to India before the 1^st of January 1962 with the intention of permanently settling in India or

4. A person of Indian origin who has migrated from Pakistan, Burma, Sri Lanka, or East African countries of Kenya, Uganda, the United Republic of Tanzania, Zambia, Malawi, Zaire, and Ethiopia or from Vietnam with the intention of permanently settling in India.

Provided that a candidate belongs to categories (2), (3) and (4) above shall be a person in whose favor a certificate of eligibility has been issued by the Government of India.

Age Limits (as on January 1, 2026)

Minimum: 21 years (born not earlier than January 2, 1994).

Maximum: 32 years (born not later than January 1, 2005).

Candidates must meet the age criteria specifically for the posts they apply for (e.g., Group 'A' vs. Group 'B').

Age Relaxations

For government servants

The upper age limit will be relaxable upto a maximum of 7 years in the case of Government servants, if they are employed in a Department mentioned in Column I below and apply for the corresponding post mentioned in column II.

Further Relaxations

Education Qualification

1. For Geologist Group ‘A’ in Geological Survey of India: Master’s degree in Geological Science or Geology or Applied Geology or Geo- Exploration or Mineral Exploration or Engineering Geology or Marine Geology or Earth Science and Resource Management or Oceanography and Coastal Areas Studies or Petroleum Geosciences or Geochemistry from a University incorporated by an Act of the Central or State Legislature in India or an educational institution established by an Act of Parliament or declared to be deemed university under section 3 of the University Grants Commission Act, 1956 (3 of 1956) i.e. recognized University.

2. For Geophysicist Group ‘A’ in Geological Survey of India and Scientist ‘B’ (Geophysics) Group ‘A’ in C.G.W.B.: M.Sc. in Physics or Applied Physics or M.Sc. (Geophysics) or Integrated M.Sc. (Exploration Geophysics) or M.Sc (Applied Geophysics) or M.Sc. (Marine Geophysics) or M.Sc. (Tech.) (Applied Geophysics) from a University incorporated by an Act of Parliament or State Legislature in India or other educational institutes established by an Act of the Parliament or declared to be deemed universities under the University Grants Commission Act, 1956

3. For Chemist Group ‘A’ in Geological Survey of India and Scientist ‘B’ (Chemical) under C.G.W.B.: M. Sc. in Chemistry or Applied Chemistry or Analytical Chemistry from a University incorporated by an Act of Parliament or State Legislature or other educational Institutes established by an Act of the Parliament or declared to be deemed Universities under section 3 of the University Grants Commission Act, 1956 i.e. recognized University.

4. For Scientist ‘B’ (Hydrogeology) Group ‘A’ and Assistant (Hydrogeologist) Group ‘B’ in C.G.W.B.: Master’s degree in Geology or applied Geology or Marine Geology or Hydrogeology from a University incorporated by an Act of the Central or State Legislature in India or other educational Institutes established by an act of Parliament or declared to be deemed as Universities under Section 3 of the University Grants Commission Act, 1956.

5. For Assistant (Chemist) Group ‘B’ in C.G.W.B.: Master of Science or Integrated Master of Science in Chemistry or Applied Chemistry or Analytical Chemistry or Physical Chemistry or Inorganic Chemistry or Organic Chemistry or Hydro-Chemistry or Industrial Chemistry from a recognized university or institute.

Notes

Candidates with overlapping qualifications (e.g., Geology for both GSI Geologist and CGWB Scientist 'B' Hydrogeology) can apply for both categories in one application (no extra fee).

No minimum percentage/marks is specified in the degree — only possession of the qualifying degree is required.

Physical/medical fitness is required per the Rights of Persons with Disabilities Act, 2016, and cadre-specific standards (Functional Classification and Physical Requirements detailed in the full rules).

Other Key Conditions

Candidates must possess valid certificates for reservations/relaxations (SC/ST/OBC/EWS/PwBD/Ex-Servicemen) by the application closing date (23.09.2025).

For EWS: Income & Asset Certificate for FY 2024-2025, issued on/after 01.04.2025 but not later than 23.09.2025.

For OBC (Non-Creamy Layer): Certificate based on income for FY 2022-2023, 2023-2024, 2024-2025, issued on/after 01.04.2025.

No changes in category (e.g., General to Reserved) are allowed after application submission (except rare cases with gap <3 months in community notification).

PwBD sub-category changes are not permitted.

Full details (including appendices on plan of exam, physical requirements) are in the official notification on upsc.gov.in 

IMPORTANT DATES

The important dates for the UPSC Combined Geo-Scientist (CGS) Examination 2026 (as per the official notification No. 01/2026-GEOL dated 03.09.2025 and consistent updates from UPSC sources) are as follows. These are fixed unless changed by UPSC (check upsc.gov.in for any updates).

EXAM ANALYSIS

Here is a complete, non-table, exam-oriented analysis of the UPSC Combined Geo-Scientist (CGS) Exam 2026, based on the latest 2025 cycle (Prelims + Mains) so you can clearly understand pattern, shifts, difficulty, and expected cutoffs.

About UPSC Combined Geo-Scientist Exam

Conducted by Union Public Service Commission

For posts like Geologist, Geophysicist, Chemist, Hydrogeologist

Selection stages:

Prelims (Objective)

Mains (Descriptive)

Interview

Last Conducted Exam (Latest Reference Cycle – 2025)

Prelims (2025)

Date: 9 February 2025

Conducted in one day

Mains (2025)

Dates: 21 & 22 June 2025

These are the latest full-cycle exams used for 2026 prediction

Shift Timing & Exam Schedule (Exact Details)

Prelims Shift Timing (2025)

Shift 1 (Paper I – General Studies): 9:30 AM – 11:30 AM

Shift 2 (Paper II – Subject): 2:00 PM – 4:00 PM

Key Points:

Two papers in a single day

Gap between shifts

No normalization (same day, same paper)

Mains Shift Timing (2025)

Conducted over 2 days with 2 shifts per day:

Morning shift: 9:00 AM – 12:00 Noon

Afternoon shift: 2:30 PM – 5:30 PM

Structure:

Day 1: Paper I & II

Day 2: Paper III + Hydrogeology (if applicable)

Exam Pattern (Confirmed)

Prelims

2 papers:

Paper I: General Studies (common)

Paper II: Subject (Geology / Geophysics / Chemistry)

Total: 400 marks

Objective type

Negative marking: 1/3rd deduction

Mains

3 descriptive papers (subject-specific)

Total: 600 marks

Highly technical, subjective answers required

Prelims Exam Analysis (2025 ? 2026 Trend)

Overall Difficulty: Moderate to Difficult

Unlike SSC/Banking:

Concept-heavy

Technical + academic depth required

Paper I (General Studies)

Topics:

Current affairs (science-based)

Environment

Basic geology concepts

General science

Difficulty: Moderate

Questions were conceptual + applied

Less factual, more analytical

Paper II (Subject Paper)

This is the deciding paper

For Geology:

Structural geology

Petrology

Stratigraphy

For Geophysics:

Numerical + theory mix

For Chemistry:

Physical + organic + analytical

Difficulty: Moderate to Difficult

Numerical + conceptual mix

Depth-based questions

Requires strong academic preparation

Prelims Good Attempts & Score Insight

Attempt depends on accuracy (not speed like SSC)

Safe attempt: around 60–70% of paper

Expected safe score:

Around 220–260 marks (out of 400)

Expected Prelims Cut-Off (Trend-Based)

Cutoffs vary by stream, but approximate safe ranges:

Geologist: ~220–250

Geophysicist: ~200–240

Chemist: ~230–270

Cutoff depends heavily on:

Paper difficulty

Number of vacancies

Stream competition

Mains Exam Analysis (2025)

Overall Difficulty: Moderate to Difficult

Real insight:

Not tricky, but very lengthy + technical

Requires deep conceptual clarity

Key Features

Fully descriptive answers

Numerical + theoretical mix

Requires:

Diagrams

Derivations

Structured explanations

Section-wise Nature

Geology / Geophysics / Chemistry Papers

Questions were:

Conceptual

Application-based

Standard UPSC level

Difficulty:

Moderate but time-consuming

Mains Performance Insight

Attempting all questions is difficult

Quality > quantity

Good performance:

Writing structured, precise answers

Covering ~70–80% effectively

Final Cut-Off Insight (2025 Trend)

Final cutoff includes:

Prelims + Mains + Interview

Examples (approx trends):

Chemist: highest cutoff (~500+)

Geologist: ~380 range

Geophysicist: ~340 range

Variation due to:

Different paper difficulty

Different number of vacancies per stream

Key Observations from Latest Cycle

Prelims is filtering stage

EXAM ANALYSIS

Here is a complete, non-table, exam-oriented analysis of the UPSC Combined Geo-Scientist (CGS) Exam 2026, based on the latest 2025 cycle (Prelims + Mains) so you can clearly understand pattern, shifts, difficulty, and expected cutoffs.

About UPSC Combined Geo-Scientist Exam

Conducted by Union Public Service Commission

For posts like Geologist, Geophysicist, Chemist, Hydrogeologist

Selection stages:

Prelims (Objective)

Mains (Descriptive)

Interview

Last Conducted Exam (Latest Reference Cycle – 2025)

Prelims (2025)

Date: 9 February 2025

Conducted in one day

Mains (2025)

Dates: 21 & 22 June 2025

These are the latest full-cycle exams used for 2026 prediction

Shift Timing & Exam Schedule (Exact Details)

Prelims Shift Timing (2025)

Shift 1 (Paper I – General Studies): 9:30 AM – 11:30 AM

Shift 2 (Paper II – Subject): 2:00 PM – 4:00 PM

Key Points:

Two papers in a single day

Gap between shifts

No normalization (same day, same paper)

Mains Shift Timing (2025)

Conducted over 2 days with 2 shifts per day:

Morning shift: 9:00 AM – 12:00 Noon

Afternoon shift: 2:30 PM – 5:30 PM

Structure:

Day 1: Paper I & II

Day 2: Paper III + Hydrogeology (if applicable)

Exam Pattern (Confirmed)

Prelims

2 papers:

Paper I: General Studies (common)

Paper II: Subject (Geology / Geophysics / Chemistry)

Total: 400 marks

Objective type

Negative marking: 1/3rd deduction

Mains

3 descriptive papers (subject-specific)

Total: 600 marks

Highly technical, subjective answers required

Prelims Exam Analysis (2025 ? 2026 Trend)

Overall Difficulty: Moderate to Difficult

Unlike SSC/Banking:

Concept-heavy

Technical + academic depth required

Paper I (General Studies)

Topics:

Current affairs (science-based)

Environment

Basic geology concepts

General science

Difficulty: Moderate

Questions were conceptual + applied

Less factual, more analytical

Paper II (Subject Paper)

This is the deciding paper

For Geology:

Structural geology

Petrology

Stratigraphy

For Geophysics:

Numerical + theory mix

For Chemistry:

Physical + organic + analytical

Difficulty: Moderate to Difficult

Numerical + conceptual mix

Depth-based questions

Requires strong academic preparation

Prelims Good Attempts & Score Insight

Attempt depends on accuracy (not speed like SSC)

Safe attempt: around 60–70% of paper

Expected safe score:

Around 220–260 marks (out of 400)

Expected Prelims Cut-Off (Trend-Based)

Cutoffs vary by stream, but approximate safe ranges:

Geologist: ~220–250

Geophysicist: ~200–240

Chemist: ~230–270

Cutoff depends heavily on:

Paper difficulty

Number of vacancies

Stream competition

Mains Exam Analysis (2025)

Overall Difficulty: Moderate to Difficult

Real insight:

Not tricky, but very lengthy + technical

Requires deep conceptual clarity

Key Features

Fully descriptive answers

Numerical + theoretical mix

Requires:

Diagrams

Derivations

Structured explanations

Section-wise Nature

Geology / Geophysics / Chemistry Papers

Questions were:

Conceptual

Application-based

Standard UPSC level

Difficulty:

Moderate but time-consuming

Mains Performance Insight

Attempting all questions is difficult

Quality > quantity

Good performance:

Writing structured, precise answers

Covering ~70–80% effectively

Final Cut-Off Insight (2025 Trend)

Final cutoff includes:

Prelims + Mains + Interview

Examples (approx trends):

Chemist: highest cutoff (~500+)

Geologist: ~380 range

Geophysicist: ~340 range

Variation due to:

Different paper difficulty

Different number of vacancies per stream

Key Observations from Latest Cycle

Prelims is filtering stage

Mains is rank deciding

Subject depth matters more than speed

No normalization ? raw marks matter

Technical accuracy > guesswork

What to Expect in UPSC CGS 2026

As per latest updates:

Prelims 2026: around February 2026

Mains 2026: around June 2026

Expected Pattern:

Same structure (no major change)

Expected Difficulty:

Prelims: Moderate–Difficult

Mains: Moderate (but lengthy)

STUDY TIPS

Preparing for the UPSC Combined Geo-Scientist (CGS) exam requires a well-structured approach that balances in-depth technical knowledge (Geology, Geophysics, or Chemistry) with General Studies (GS) preparation. The examination is conducted in three stages—Prelims (Objective), Mains (Descriptive), and the Personality Test.

1. Understand the Exam Pattern & Syllabus

Go through the Prelims and Mains syllabus in detail for your chosen discipline (Geology / Geophysics / Chemistry / Hydrogeology).

Focus on core concepts and numerical problems.

2. Strengthen Subject Fundamentals

Use standard textbooks and university-level notes.

Revise formulas, diagrams, and derivations regularly.

3. Practice Previous Year Questions

Solve UPSC CGS previous year papers to understand question trends and difficulty level.

Focus on concept-based and analytical questions.

4. Make Short Notes

Prepare concise revision notes for formulas, definitions, and key diagrams.

Revise them weekly.

5. Time Management & Mock Tests

Attempt mock tests under exam conditions.

Analyze mistakes to improve speed and accuracy.

6. Revision & Consistency

Revise each subject multiple times.

Maintain consistency rather than long study hours.

 7. Interview Preparation (Later Stage)

Be clear with core subject concepts.

Stay updated with developments in earth sciences.

6-Month Study Plan 

Month 1: Syllabus & Fundamentals

Understand UPSC CGS exam pattern and detailed syllabus

Start core subject basics (your optional discipline)

Revise important formulas, diagrams, and definitions

Study 4–5 hours daily

Month 2: Core Subject – Part 1

Continue in-depth theory of major topics

Solve topic-wise numerical and conceptual questions

Begin previous year questions (PYQs) side-by-side

Month 3: Core Subject – Part 2

Complete remaining syllabus of core subjects

Practice answer writing (Mains-oriented)

Revise previously covered topics weekly

Month 4: Revision + Prelims Focus

First full revision of entire syllabus

Attempt Prelims mock tests regularly

Improve speed and accuracy

Analyze mistakes thoroughly

Month 5: Mains Answer Writing

Focus on Mains descriptive practice

Practice diagrams, derivations, and numericals

Revise formulas and concepts daily

Attempt section-wise Mains mock tests

Month 6: Final Revision & Exam Readiness

Final revision of all subjects

Attempt full-length Prelims & Mains mock tests

Revise short notes and key formulas

Avoid new topics

Important Tips

PYQs are the most important resource

Focus on conceptual clarity + presentation

Revise diagrams and numericals regularly

Maintain consistency

3-Month Study Plan

Month 1: Core Concepts & Syllabus Coverage

Understand the UPSC CGS exam pattern and syllabus

Cover major theory topics of your core subject (Geology / Geophysics / Chemistry / Hydrogeology)

Make short notes for formulas, diagrams, and definitions

Solve topic-wise PYQs

Month 2: Practice & Strengthening

Complete remaining syllabus

Focus on numerical problem-solving

Begin Mains answer writing practice

Attempt section-wise mock tests

Month 3: Revision & Mock Tests

Revise entire syllabus 2–3 times

Attempt full-length Prelims & Mains mock tests

Analyze mistakes and improve accuracy

STUDY TIPS

Preparing for the UPSC Combined Geo-Scientist (CGS) exam requires a well-structured approach that balances in-depth technical knowledge (Geology, Geophysics, or Chemistry) with General Studies (GS) preparation. The examination is conducted in three stages—Prelims (Objective), Mains (Descriptive), and the Personality Test.

1. Understand the Exam Pattern & Syllabus

Go through the Prelims and Mains syllabus in detail for your chosen discipline (Geology / Geophysics / Chemistry / Hydrogeology).

Focus on core concepts and numerical problems.

2. Strengthen Subject Fundamentals

Use standard textbooks and university-level notes.

Revise formulas, diagrams, and derivations regularly.

3. Practice Previous Year Questions

Solve UPSC CGS previous year papers to understand question trends and difficulty level.

Focus on concept-based and analytical questions.

4. Make Short Notes

Prepare concise revision notes for formulas, definitions, and key diagrams.

Revise them weekly.

5. Time Management & Mock Tests

Attempt mock tests under exam conditions.

Analyze mistakes to improve speed and accuracy.

6. Revision & Consistency

Revise each subject multiple times.

Maintain consistency rather than long study hours.

 7. Interview Preparation (Later Stage)

Be clear with core subject concepts.

Stay updated with developments in earth sciences.

6-Month Study Plan 

Month 1: Syllabus & Fundamentals

Understand UPSC CGS exam pattern and detailed syllabus

Start core subject basics (your optional discipline)

Revise important formulas, diagrams, and definitions

Study 4–5 hours daily

Month 2: Core Subject – Part 1

Continue in-depth theory of major topics

Solve topic-wise numerical and conceptual questions

Begin previous year questions (PYQs) side-by-side

Month 3: Core Subject – Part 2

Complete remaining syllabus of core subjects

Practice answer writing (Mains-oriented)

Revise previously covered topics weekly

Month 4: Revision + Prelims Focus

First full revision of entire syllabus

Attempt Prelims mock tests regularly

Improve speed and accuracy

Analyze mistakes thoroughly

Month 5: Mains Answer Writing

Focus on Mains descriptive practice

Practice diagrams, derivations, and numericals

Revise formulas and concepts daily

Attempt section-wise Mains mock tests

Month 6: Final Revision & Exam Readiness

Final revision of all subjects

Attempt full-length Prelims & Mains mock tests

Revise short notes and key formulas

Avoid new topics

Important Tips

PYQs are the most important resource

Focus on conceptual clarity + presentation

Revise diagrams and numericals regularly

Maintain consistency

3-Month Study Plan

Month 1: Core Concepts & Syllabus Coverage

Understand the UPSC CGS exam pattern and syllabus

Cover major theory topics of your core subject (Geology / Geophysics / Chemistry / Hydrogeology)

Make short notes for formulas, diagrams, and definitions

Solve topic-wise PYQs

Month 2: Practice & Strengthening

Complete remaining syllabus

Focus on numerical problem-solving

Begin Mains answer writing practice

Attempt section-wise mock tests

Month 3: Revision & Mock Tests

Revise entire syllabus 2–3 times

Attempt full-length Prelims & Mains mock tests

Analyze mistakes and improve accuracy

Focus on presentation, diagrams, and time management

Preparation Tips

Prioritize previous year questions

Revise formulas and concepts daily

Practice diagrams neatly

Avoid new topics in the last weeks

1 Month Study Plan

Week 1: Core Revision

Revise entire syllabus topic-wise

Focus on important formulas, diagrams, and definitions

Solve previous year questions (PYQs) daily

Week 2: Practice & Strengthening

Attempt section-wise mock tests

Work on weak areas

Practice numerical problems and answer writing

Week 3: Full-Length Mock Tests

Attempt 2–3 full-length Prelims & Mains mock tests

Analyze mistakes and improve speed and accuracy

Revise short notes regularly

Week 4: Final Revision

Final revision of key concepts and formulas

Practice diagrams lightly

Avoid new topics and stay calm

Last-Month Tips

Revise notes, not new books

Focus on accuracy and presentation

Manage time effectively

Sleep well before the exam

OVERVIEW

The Combined Geo-Scientist Examination, commonly known as CGS, is a national-level competitive examination conducted by the Union Public Service Commission (UPSC) under the Government of India. Through this examination, candidates are recruited for various technical posts in central government departments such as the Geological Survey of India (GSI) under the Ministry of Mines and the Central Water Board (CWB) under the Ministry of Jal Shakti, for Group ‘A’ and Group ‘B’ positions.

For the UPSC CGS 2026, the primary objective of the examination is to select qualified candidates for Category-I posts, including Geologist, Geophysicist, Chemist, and Junior Hydrologist under the Central Government. This examination serves as the entry-level gateway for aspirants seeking a professional career in geoscience and allied technical services through the Union Public Service Commission.

SELECTION PROCESS

The UPSC Combined Geo-Scientist (CGS) Examination 2026 is a multi-stage recruitment process conducted by the Union Public Service Commission (UPSC) to fill Group 'A' and Group 'B' posts in the Geological Survey of India (GSI) under the Ministry of Mines and the Central Ground Water Board (CGWB) under the Ministry of Jal Shakti. It is strictly merit-based, with provisional admission at every stage subject to final verification of eligibility, documents, and medical fitness.

The process consists of three successive stages:

1. Stage I: Preliminary Examination

Nature: Objective-type screening test (OMR-based).

Date: 8th February 2026.

Papers: Two papers (total 400 marks):

Paper-I: General Studies (100 marks, 2 hours).

Paper-II: Subject-specific (Geology/Hydrogeology, Geophysics, or Chemistry; 300 marks, 2 hours).

Negative Marking: 1/3rd marks deducted for wrong answers.

Purpose: To shortlist candidates for the Main Examination. Marks from Prelims are counted toward deciding the final merit in some contexts, but primarily serve as a qualifier.

Shortlisting Ratio: Approximately 6-7 times the number of vacancies (to allow for the Main stage).

Outcome: Candidates qualifying the Prelims (based on cut-off decided by UPSC) are declared qualified and allowed to appear for the Main Examination. Results are published on upsc.gov.in.

2. Stage II: Main Examination

Nature: Descriptive/Conventional type (pen-paper).

Date: 20th & 21st June 2026.

Papers: Three papers (total 600 marks, 3 hours each), subject-specific (Geology, Geophysics, or Chemistry stream based on applied category).

Purpose: To assess in-depth knowledge and analytical skills. Marks from Mains are counted for the final merit.

Shortlisting for Interview: Candidates who secure minimum qualifying marks (as decided by UPSC) in the Mains are called for the Personality Test. The number shortlisted is typically based on vacancies and merit.

Outcome: Main results are declared, and qualified candidates proceed to the Interview stage.

3. Stage III: Personality Test / Interview

Marks: 200

Nature: Oral interview by a UPSC board (usually 20-30 minutes).

Purpose: To evaluate personality, suitability for geo-scientific roles, depth of subject knowledge, communication skills, awareness of current geo-scientific issues (e.g., mineral exploration, groundwater management, natural hazards), and general awareness.

No fixed syllabus: Questions draw from bio-data, Mains performance, and relevant current affairs.

Outcome: Marks are added to Mains for final merit.

Final Merit List and Allocation

Final Merit Calculation: Based on Mains (600 marks) + Personality Test (200 marks) = 800 marks total. Prelims marks may influence shortlisting, but are not added to the final merit list in standard practice (though notification notes they count for final merit in some aspects).

OVERVIEW

The Combined Geo-Scientist Examination, commonly known as CGS, is a national-level competitive examination conducted by the Union Public Service Commission (UPSC) under the Government of India. Through this examination, candidates are recruited for various technical posts in central government departments such as the Geological Survey of India (GSI) under the Ministry of Mines and the Central Water Board (CWB) under the Ministry of Jal Shakti, for Group ‘A’ and Group ‘B’ positions.

For the UPSC CGS 2026, the primary objective of the examination is to select qualified candidates for Category-I posts, including Geologist, Geophysicist, Chemist, and Junior Hydrologist under the Central Government. This examination serves as the entry-level gateway for aspirants seeking a professional career in geoscience and allied technical services through the Union Public Service Commission.

SELECTION PROCESS

The UPSC Combined Geo-Scientist (CGS) Examination 2026 is a multi-stage recruitment process conducted by the Union Public Service Commission (UPSC) to fill Group 'A' and Group 'B' posts in the Geological Survey of India (GSI) under the Ministry of Mines and the Central Ground Water Board (CGWB) under the Ministry of Jal Shakti. It is strictly merit-based, with provisional admission at every stage subject to final verification of eligibility, documents, and medical fitness.

The process consists of three successive stages:

1. Stage I: Preliminary Examination

Nature: Objective-type screening test (OMR-based).

Date: 8th February 2026.

Papers: Two papers (total 400 marks):

Paper-I: General Studies (100 marks, 2 hours).

Paper-II: Subject-specific (Geology/Hydrogeology, Geophysics, or Chemistry; 300 marks, 2 hours).

Negative Marking: 1/3rd marks deducted for wrong answers.

Purpose: To shortlist candidates for the Main Examination. Marks from Prelims are counted toward deciding the final merit in some contexts, but primarily serve as a qualifier.

Shortlisting Ratio: Approximately 6-7 times the number of vacancies (to allow for the Main stage).

Outcome: Candidates qualifying the Prelims (based on cut-off decided by UPSC) are declared qualified and allowed to appear for the Main Examination. Results are published on upsc.gov.in.

2. Stage II: Main Examination

Nature: Descriptive/Conventional type (pen-paper).

Date: 20th & 21st June 2026.

Papers: Three papers (total 600 marks, 3 hours each), subject-specific (Geology, Geophysics, or Chemistry stream based on applied category).

Purpose: To assess in-depth knowledge and analytical skills. Marks from Mains are counted for the final merit.

Shortlisting for Interview: Candidates who secure minimum qualifying marks (as decided by UPSC) in the Mains are called for the Personality Test. The number shortlisted is typically based on vacancies and merit.

Outcome: Main results are declared, and qualified candidates proceed to the Interview stage.

3. Stage III: Personality Test / Interview

Marks: 200

Nature: Oral interview by a UPSC board (usually 20-30 minutes).

Purpose: To evaluate personality, suitability for geo-scientific roles, depth of subject knowledge, communication skills, awareness of current geo-scientific issues (e.g., mineral exploration, groundwater management, natural hazards), and general awareness.

No fixed syllabus: Questions draw from bio-data, Mains performance, and relevant current affairs.

Outcome: Marks are added to Mains for final merit.

Final Merit List and Allocation

Final Merit Calculation: Based on Mains (600 marks) + Personality Test (200 marks) = 800 marks total. Prelims marks may influence shortlisting, but are not added to the final merit list in standard practice (though notification notes they count for final merit in some aspects).

Merit Position: Candidates are ranked in order of merit within their category (General, SC/ST/OBC/EWS/PwBD, etc.).

Post Allocation:

Strictly according to merit position, number of vacancies, and preferences (candidates can apply for one or both categories — GSI or CGWB — in one application).

Separate merit lists for:

Category-I: Posts in GSI (Geologist, Geophysicist, Chemist Group 'A').

Category-II: Posts in CGWB (Scientist 'B' in Hydrogeology/Chemical/Geophysics Group 'A'; Assistant Hydrogeologist/Chemist/Geophysicist Group 'B').

Selection is category-wise and vacancy-specific. Overlapping qualifications allow competition in both, but allocation follows merit and vacancies separately.

Reservation: Applied as per Government rules (SC/ST/OBC/EWS/PwBD/Ex-Servicemen). Reservations are category-specific and cannot be interchanged post-result except in rare documented cases.

Final Result: Declared by UPSC after Interview. Recommended candidates receive appointment letters from respective ministries (Mines for GSI, Jal Shakti for CGWB).

Steps After Merit List

Document Verification: Conducted after qualifying for Interview/Personality Test (or post-final result). Original documents (educational certificates, age proof, category certificates, photo ID, etc.) are verified. Provisional admission can be cancelled if discrepancies arise.

Medical Examination: Candidates must meet prescribed physical/medical standards (as per Rights of Persons with Disabilities Act, 2016, and cadre-specific Functional Classification/Physical Requirements). For PwBD candidates, disability must be ?40% and suitable for the post.

Appointment: On temporary basis initially. Final offer depends on clearance of all verifications and fitness. No withdrawal of application is allowed post-submission.

Key Notes

Admission at all stages is purely provisional; mere issue of admit card does not guarantee eligibility.

No request for category change (e.g., General to Reserved) is entertained after application, except exceptional cases (<3 months gap in community notification).

The process emphasizes merit, with strict adherence to rules notified in the Gazette of India (dated 03.09.2025).

For the most accurate and latest details (including any updates), refer to the official notification PDF on upsc.gov.in.