UPSC CSAT Syllabus 2027

The Civil Services Aptitude Test is the second paper of the Preliminary Examination. It is qualifying in nature, which has led a great many candidates to treat it as a formality. The record does not support that view. In several recent cycles the CSAT has removed candidates who scored comfortably in General Studies Paper I, and it remains the single most avoidable reason for failing at the first stage.

The Union Public Service Commission will conduct the Civil Services (Preliminary) Examination 2027 on 23 May 2027. Paper II is held in the afternoon session of the same day. The notification carrying the official syllabus is scheduled for 13 January 2027, and no revision to the CSAT framework has been notified.

This page sets out the CSAT syllabus for 2027 in full — the seven areas as the Commission states them, each expanded into the topics that actually appear in the paper — together with the exam pattern, the marking scheme, ten years of observed weightage and a working preparation approach.

CSAT 2027 — Key Dates

Both papers are held on the same day. A candidate who appears for one but not the other stands disqualified.

What CSAT Is, and What Qualifying Actually Means

CSAT tests aptitude rather than knowledge. There is no syllabus to memorise in the conventional sense — no list of facts, no current affairs component, no subject reading. What the paper measures is whether a candidate can read a dense passage accurately, reason through a structured problem, and handle arithmetic and data at school level under time pressure.

The qualifying threshold is 33 per cent, which works out to 66.67 marks out of 200. Three consequences follow, and each is commonly misunderstood.

• Marks above the threshold count for nothing. A candidate scoring 180 and a candidate scoring 70 stand in exactly the same position. The Preliminary cut-off is calculated on General Studies Paper I alone.
• Marks below the threshold end the attempt entirely. A candidate who scores 120 in Paper I — well above any cut-off in the last decade — but 60 in CSAT does not proceed to the Main Examination. The Paper I score is not evaluated.
• Qualifying does not mean easy. The paper has grown appreciably harder since 2020, particularly in the length and abstraction of its comprehension passages and the arithmetic load. Candidates from humanities and language backgrounds who last did mathematics in Class X should plan for sustained practice rather than a fortnight of revision.

CSAT Exam Pattern 2027

Marking Scheme in Detail

• Each of the 80 questions carries 2.5 marks, totalling 200.
• One-third of the marks assigned to a question is deducted for a wrong answer. Since each question carries 2.5 marks, the deduction is 0.83 marks — not 0.33, a figure frequently quoted in error.
• Questions left unanswered attract no penalty.
• Questions in the decision-making segment carry no negative marking. Every such question should therefore be attempted, whatever the level of certainty.
• A candidate needs roughly 27 correct answers out of 80, with no wrong answers, to reach the qualifying mark. Accounting for a realistic error rate, 32 to 35 correct attempts is the working target.

Candidates with visual impairment receive compensatory time as specified in the notification.

Official CSAT Syllabus 2027

The Commission states the syllabus for Paper II in seven lines:

1. Comprehension
2. Interpersonal skills including communication skills
3. Logical reasoning and analytical ability
4. Decision-making and problem-solving
5. General mental ability
6. Basic numeracy — numbers and their relations, orders of magnitude and similar topics, at Class X level
7. Data interpretation — charts, graphs, tables, data sufficiency and similar topics, at Class X level

Each is expanded below into the topics that have generated questions in recent papers.

Topic-Wise Breakdown

1. Comprehension

The largest component of the paper, and in recent years the decisive one.

• Direct comprehension — locating stated information within the passage
• Inferential comprehension — drawing conclusions the passage supports but does not state
• Identifying the central idea, tone and purpose of a passage
• Assumption-based questions — what the author must be taking for granted
• Distinguishing valid conclusions from plausible but unsupported ones
• Passages typically drawn from governance, public administration, environment, economics, sociology and philosophy

Passages have grown longer and more abstract since 2020. Several now run past 350 words and carry a single question. The skill being tested is disciplined reading, not speed reading — the correct option is usually the most conservative one, and the wrong options are usually true statements that the passage does not actually support.

2. Interpersonal Skills Including Communication Skills

• Situational judgement in administrative and workplace contexts
• Principles of effective communication
• Interpersonal reasoning — handling conflict, delegation, feedback

This segment has appeared only sparingly in recent papers. It requires no preparation beyond the reasoning candidates already apply to decision-making questions.

3. Logical Reasoning and Analytical Ability

• Syllogisms and categorical propositions
• Statement and assumption; statement and conclusion; statement and argument
• Courses of action
• Cause and effect
• Blood relations
• Direction sense
• Seating and circular arrangements
• Ordering, ranking and grouping
• Coding and decoding
• Analytical puzzles based on given conditions
• Venn diagram reasoning

4. Decision-Making and Problem-Solving

• Administrative situations with several defensible responses
• Ethical dilemmas placed in a workplace or field setting
• Prioritising among competing obligations
• Practical problems requiring an analytical rather than a rule-based answer

5. General Mental Ability

• Number and letter series
• Analogies and classification
• Calendars and clocks
• Cubes, dice and figure counting
• Simplification and approximation
• Ratio and proportion
• Averages and mixtures
• Percentages
• Profit, loss and discount
• Simple and compound interest
• Time and work; pipes and cisterns
• Time, speed and distance; trains, boats and streams
• Problems on ages
• Permutation, combination and probability

6. Basic Numeracy — Class X Level

• Number systems, divisibility, remainders
• LCM and HCF
• Fractions, decimals and surds
• Orders of magnitude and approximation
• Algebraic expressions and simple equations
• Progressions
• Mensuration — areas, volumes, surface areas
• Elementary geometry

The Commission's phrase "Class X level" describes the difficulty of the concepts, not the difficulty of the questions. A question can combine two Class X concepts and still take three minutes to solve.

7. Data Interpretation — Class X Level

• Tables
• Bar graphs, including stacked and grouped
• Pie charts
• Line graphs
• Caselets — data presented in prose rather than a chart
• Mixed and combined data sets
• Data sufficiency

Data sufficiency deserves separate mention. The question asks whether the given statements are enough to answer, not what the answer is. Candidates who solve fully rather than assessing sufficiency lose time they cannot recover.

↑ Back to top

Observed Weightage, 2016 to 2025

The Commission publishes no weightage. The table below reflects the distribution observed across past papers, expressed as approximate question counts out of 80. It should be read as a record of what has happened, not as a forecast.

Two patterns are worth drawing out.

The paper shifted decisively towards mathematics after 2019. Where reasoning once carried close to thirty questions, it now carries around fifteen, and the space has gone to numeracy and data interpretation. A candidate preparing on the basis of pre-2020 papers alone will prepare for the wrong paper.

Comprehension has held steady at roughly a third throughout. It is the one section whose weight has not moved in a decade, which makes it the most reliable place to build a qualifying score — and the section most candidates neglect on the assumption that reading needs no practice.

Why Candidates Fail CSAT

The reasons are consistent enough to be worth stating plainly.

• Deferring it entirely. The commonest pattern is a candidate who intends to start CSAT after finishing General Studies, and finds in April that no time remains.
• Assuming a graduate degree is sufficient. Aptitude at Class X level is not the same as familiarity with it. Speed under a two-hour constraint comes only from practice.
• Misjudging time within the paper. Eighty questions in 120 minutes allows ninety seconds each. A single long comprehension passage or a compound arithmetic question can consume five minutes. Candidates who attempt the paper in order, without triage, routinely leave twenty questions unread.
• Over-attempting. With a 0.83-mark penalty, three wrong answers cancel one correct one. A candidate attempting 65 questions with 35 correct scores 62.5 — below the threshold — while a candidate attempting 40 with 32 correct scores 73.4 and qualifies. Selectivity outperforms volume.
• Neglecting comprehension. Roughly a third of the paper needs no calculation at all. Candidates who practise only arithmetic leave their most accessible marks on the table.

The candidate who attempts forty questions carefully clears CSAT more often than the candidate who attempts seventy in a hurry. Accuracy is not a virtue in this paper — it is the arithmetic of the marking scheme. — Legacy IAS Faculty

Preparing for CSAT 2027

1. Begin now, in small fixed slots. Two hours a week from the middle of 2026 amounts to well over a hundred hours by May 2027 — far more than any compressed effort in the final months can deliver, and at no cost to General Studies preparation.
2. Diagnose before you study. Attempt one full previous year paper under timed conditions before opening a single book. The result tells you whether your gap is arithmetic, reasoning or reading, and the three require quite different remedies.
3. Solve past papers before solving practice books. Ten years of CSAT papers is the most accurate available guide to difficulty and framing. Commercial question banks are useful for drilling once that baseline exists.
4. Practise comprehension daily and briefly. Two passages a day, worked carefully rather than quickly, builds the accuracy the paper rewards. Editorial pages serve well as source material.
5. Rehearse triage, not just solving. In every full-length attempt, take one pass to mark questions as attempt-now, attempt-later or skip. The ability to abandon a question is worth more marks than the ability to solve a difficult one.
6. Take full-length tests in the afternoon. CSAT is written after two hours of General Studies. Practising it fresh in the morning trains for conditions that will not exist on examination day.

Standard Reference Books

The following are the commonly used titles. One book per area, worked thoroughly, is more useful than several sampled.

• Analytical Reasoning — M. K. Pandey
• CSAT Paper II Manual — Tata McGraw Hill
• A Modern Approach to Verbal and Non-Verbal Reasoning — R. S. Aggarwal
• Quantitative Aptitude for Competitive Examinations — R. S. Aggarwal
• Cracking the CSAT Paper II — Arihant
• NCERT Mathematics, Classes VI to X, for candidates rebuilding fundamentals

Previous year question papers from 2011 onwards remain the single most valuable resource, and they are available free from the Commission's website.

Frequently Asked Questions

Has the CSAT syllabus changed for 2027?

No change has been notified. The seven-line framework has stood since 2011 and the same is expected in the 13 January 2027 notification. Verify against the official document when it is published.

How many marks are needed to qualify CSAT?

66.67 out of 200, which is 33 per cent. Marks above this carry no advantage; marks below it end the attempt.

How many questions should I attempt?

There is no fixed number. Attempting around 45 to 50 with high accuracy is a common qualifying profile. Given the 0.83-mark penalty, accuracy matters considerably more than volume.

Is there negative marking in CSAT?

Yes, one-third of the marks allotted to the question. As each question carries 2.5 marks, the deduction is 0.83 marks. The decision-making segment is the sole exception and carries no penalty.

Do CSAT marks count towards the Prelims cut-off?

No. The Preliminary cut-off is calculated on General Studies Paper I alone. CSAT determines only whether a candidate is eligible to be considered.

Is CSAT harder for candidates from non-mathematics backgrounds?

The arithmetic component demands more effort from candidates who have not used mathematics since school. It is a matter of practice rather than aptitude, and it is why early, regular preparation matters more here than in any other part of the Preliminary Examination.

How long does CSAT preparation take?

For a candidate comfortable with Class X mathematics, sixty to eighty hours spread across the year is usually sufficient. For a candidate starting from a weak base, twice that, begun early enough to be spread thinly.

↑ Back to top