CSIR SO Exam Pattern : Stage-wise Marks, Time and Merit

The CSIR SO exam pattern follows the Combined Administrative Services Examination (CASE) of the Council of Scientific and Industrial Research. Section Officer candidates take two objective papers in Stage I, a descriptive paper in Stage II and then an interview. The written papers carry 500 marks, the interview 100, and the final merit list is built on the total of 600.

This page explains each stage as per the CASE-2023 advertisement, which is the latest official CASE scheme as of October 2026. It also covers the separate 2026 Section Officer drive for UPSC Civil Services candidates, which followed a completely different pattern, and turns the numbers into a practical time and scoring plan.

CSIR SO Exam Pattern at a Glance

In CASE-2023, Stage I ran as a CBT from 5 to 20 February 2024, with Paper I in the morning (10:00 AM to 12:00 noon) and Paper II in the afternoon (3:00 PM to 5:30 PM) on the same day. Stage II was held on 7 July 2024.

Stage I: Paper I and Paper II

Paper I: General Awareness and English Language and Comprehension

Paper II: General Intelligence, Reasoning and Mental Ability

Qualifying rule: Candidates must reach a minimum threshold in the aggregate of Paper I and Paper II (out of 350) to qualify for Stage II. CSIR does not publish this threshold in advance; it is decided by the competent authority. In CASE-2023, the Stage I shortlist was released in June 2024.

Stage II: Paper III (Descriptive)

In CASE-2023, Paper III was a pen-and-paper test in a question-cum-answer booklet, and candidates could write in English or Hindi. To be called for the interview, Section Officer candidates must reach the threshold in the aggregate of Papers I, II and III (out of 500).

How Paper III answers are usually structured

• Essay: A short introduction that defines the issue, three or four body sections with facts and examples, and a balanced conclusion with a way forward.

• Precis: A title, then the central idea in your own words in about one-third of the original length, without examples or opinions.

• Letter or application: Correct format (sender, date, addressee, subject, salutation, body, closing), formal tone and a clear request or point.

Interview for Section Officer

The interview carries 100 marks and applies only to Section Officer candidates. It checks communication, awareness of current issues, understanding of administration and suitability for a supervisory post. Assistant Section Officer candidates take a qualifying Computer Proficiency Test instead and have no interview.

Marking Scheme and Negative Marking

Older pages may still show 0.25 marks as the penalty, so follow the official advertisement.

A simple way to see the cost of guessing: if you attempt 20 questions and get 15 right and 5 wrong, your score is $15 - (5 \times 0.33) = 13.35$ marks, not 15.

Exam Mode, Language and Centres

Exam cities can change in the next notification, so check the list before choosing your centre.

Normalisation, Answer Key and Re-evaluation

• Normalisation: When the CBT runs in multiple shifts, CSIR normalises scores using a method it notifies on its website, so a tougher shift does not put you at a disadvantage.

• Answer key: In CASE-2023, CSIR released a provisional answer key after Stage I, and candidates could raise objections by paying Rs. 100 per question.

• No re-evaluation: The advertisement states there is no provision for re-evaluation or re-checking of scores.

What the Pattern Means for You

• Paper II carries more weight: It has 200 of the 350 Stage I marks and 33 percent of the 600-mark total, so it deserves the largest share of your preparation time.

• Time per question is tight: Paper II gives 150 minutes for 200 questions, which is 45 seconds per question. Paper I gives 48 seconds per question.

• Equal subjects, unequal effort: Each Paper II subject is worth 25 marks. Ethics, decision making and management usually take less time per mark than arithmetic, so use them to build a safe base.

• Writing decides rank: Paper III (150) plus the interview (100) make up 250 of the 600 marks. Strong Stage I scorers can still lose rank with weak essays.

Suggested Attempt Targets

The targets below are planning benchmarks based on the CASE-2023 Stage I threshold reported for UR (about 260 out of 350). They are not official figures.

Hitting these numbers in mocks, after negative marking, puts you roughly 10 marks above the last reported UR threshold.

Final Merit Calculation

The final Section Officer merit list is based on:

$\text{Final score} = \text{Paper I} + \text{Paper II} + \text{Paper III} + \text{Interview}$ (maximum 600)

This example is for illustration only. For comparison, the official CASE-2023 final cut-off for UR Section Officer was 430.34 out of 600, so this candidate would have fallen short by about 10 marks.

For ties, CASE-2023 used higher marks in the written papers, then fewer negative marks, then older age, then earlier acquisition of the essential degree, and finally alphabetical order of first names.

2026 SO Drive: UPSC CSE Route Pattern

In January 2026, CSIR recruited 8 Section Officers (Advt. No. E-I/RC/2026/1) only from non-recommended candidates of the UPSC Civil Services Examination 2024. This drive had no written test by CSIR.

This route depends on CSIR's decision for each drive, so do not assume it will repeat. CASE remains the open route for all eligible graduates.

SO vs ASO Pattern Differences

Time Management and Exam-Day Strategy

1. Paper I order: Start with English (about 35 minutes for 50 questions), then General Awareness. Static questions are faster, so answer those before current affairs that need recall.

2. Paper II rounds: In round one, attempt ethics, decision making, management, geography and science questions you know. In round two, solve reasoning and arithmetic. Leave long puzzles for the end.

3. Accuracy target: Aim for 85 percent or higher accuracy in practice. Below that, negative marking eats into your score quickly.

4. Break between papers: Use the gap between Paper I and Paper II to eat, rest and avoid discussing answers, which only adds stress before the longer paper.

5. Paper III split: Spend about 5 minutes planning, 50 minutes per essay and the remaining time on the precis and letter.

Official website: https://www.csir.res.in/