UPSC CSAT Syllabus
2027 — Topic-Wise
Maths & Reasoning
The UPSC CSAT Syllabus 2027 (General Studies Paper II) is built around 7 core sections — comprehension, reasoning, numeracy, and data interpretation. This is the complete, topic-wise breakdown of the Maths and Reasoning syllabus, plus the exam pattern and what to prioritise.
The UPSC CSAT Syllabus 2027 has 7 components: (1) Comprehension, (2) Interpersonal & communication skills, (3) Logical reasoning & analytical ability, (4) Decision-making & problem-solving, (5) General mental ability, (6) Basic numeracy (Class X level), and (7) Data interpretation (Class X level). The paper has 80 questions for 200 marks in 2 hours, with ⅓ negative marking, and is qualifying at 33% (66.67 marks). The syllabus is unchanged for 2027.
The UPSC CSAT (Civil Services Aptitude Test), also called General Studies Paper II, was introduced in 2011 and is a mandatory qualifying paper in the Prelims. It tests your comprehension, logical reasoning, general mental ability, and basic numeracy. Knowing the exact syllabus is the first step to a smart preparation plan — so here is the complete, topic-wise CSAT Syllabus 2027.
The syllabus is your map. Most CSAT failures aren't from inability — they're from aspirants wandering without knowing the terrain. Master what's actually tested, in the right proportion, and the paper stops being a threat. — Legacy IAS Faculty
The 7 Components of the CSAT Syllabus 2027
As per the official UPSC notification, the CSAT (Paper II) syllabus comprises seven broad areas:
| # | Component | What It Tests |
|---|---|---|
| 1 | Comprehension | Reading and interpreting passages — the largest section in recent papers. |
| 2 | Interpersonal & Communication Skills | Understanding communication and interpersonal situations. |
| 3 | Logical Reasoning & Analytical Ability | Logic, patterns, arguments, and analytical deduction. |
| 4 | Decision-Making & Problem-Solving | Choosing the best course of action in given situations. |
| 5 | General Mental Ability | Aptitude — arithmetic reasoning, sequences, and logic. |
| 6 | Basic Numeracy | Numbers and their relations, orders of magnitude (Class X level). |
| 7 | Data Interpretation | Charts, graphs, tables, and data sufficiency (Class X level). |
First, the numeracy and data-interpretation questions are officially of Class X (10th standard) level — so you don't need advanced maths. Second, decision-making questions traditionally carry no negative marking (though they've been rare in the most recent papers).
CSAT Exam Pattern 2027
| Feature | Detail |
|---|---|
| Paper | UPSC Prelims Paper II (GS Paper-2 / CSAT) |
| Total Marks | 200 |
| Number of Questions | 80 (objective / MCQ) |
| Marks per Question | 2.5 |
| Negative Marking | ⅓ of allotted marks (≈0.83) per wrong answer |
| Duration | 2 hours |
| Mode | Pen & paper (offline) |
| Qualifying Marks | 33% = 66.67 out of 200 |
| Nature | Qualifying — not counted in merit |
CSAT Maths Syllabus 2027 (Topic-Wise)
The numeracy and aptitude portion splits into Basic Numeracy and General Mental Ability (arithmetic). Here is the full topic list:
| Basic Numeracy | General Mental Ability (Arithmetic) |
|---|---|
| Number System | Time & Distance |
| LCM & HCF | Time & Work |
| Rational Numbers & Ordering | Work & Wages |
| Square Roots & Cube Roots | Pipes & Cisterns |
| Surds & Indices | Trains |
| Divisibility Rules | Boats & Streams |
| Decimal Fractions & Simplification | Profit & Loss |
| Averages | Partnership |
| Ratio & Proportion | Simple & Compound Interest |
| Percentages | Alligation & Mixtures |
| Remainder Theorem | Permutation & Combination |
| Set Theory | Mensuration & Area |
| Probability | Geometry |
CSAT Reasoning Syllabus 2027 (Topic-Wise)
The reasoning portion has two parts — Logical Reasoning & Analytical Ability (LR & AA) and Data Interpretation & Data Sufficiency (DI & DS):
| Logical Reasoning & Analytical Ability | Data Interpretation & Data Sufficiency |
|---|---|
| Syllogism | Coding-Decoding |
| Statements & Conclusions | Blood Relations |
| Statements & Assumptions | Seating Arrangement |
| Statements & Arguments | Direction Sense Test |
| Cause & Effect | Logical Venn Diagrams |
| Analytical Reasoning | Alphabet Test |
| Mathematical Puzzles & Patterns | Series & Classification |
| Cubes & Dice | Analogy |
| Calendars & Clocks | Mathematical Operations |
| Number Ranking & Time Sequence | Table, Bar & Pie Charts |
| Situation Reaction & Eligibility Tests | Arithmetical Reasoning |
| Inserting the Missing Character | Data Sufficiency |
What to Prioritise — Smart Weightage (Value Addition)
The syllabus is broad, but recent papers concentrate marks in a few areas. Prioritise accordingly:
Comprehension First
RC is the largest section (~28-30 Q) and now the toughest — it carries the most weight, so never neglect it.
Number System & Arithmetic
In maths, the Number System dominates almost every year, with percentages, ratio, TSD & profit-loss close behind.
High-Value Reasoning
Syllogism, seating, blood relations, direction sense & analytical reasoning appear most — and offer definite answers.
Since 2023, CSAT has become genuinely tough — reading-comprehension passages are getting longer and more abstract, and quantitative aptitude now rewards conceptual clarity over memorised tricks. Topics like permutation-combination and probability appear irregularly (present in 2023, absent in 2024), so build a strong core rather than chasing every topic. Treat CSAT like a core paper, not a formality.
How to Use This Syllabus
- Map your strengths & gaps: tick off topics you're comfortable with and flag the weak ones to target first.
- Build the core: secure the high-weightage areas — comprehension, number system, arithmetic, and high-frequency reasoning — before the rare topics.
- Practise from PYQs: solve 8-10 years of previous papers to see exactly how each syllabus topic is tested.
- Take timed mocks: the syllabus tells you what; mock tests train the speed and accuracy the paper actually demands.
Frequently Asked Questions
Q1. What is the UPSC CSAT syllabus 2027?
The CSAT 2027 syllabus (GS Paper II) covers seven areas: comprehension; interpersonal & communication skills; logical reasoning & analytical ability; decision-making & problem-solving; general mental ability; basic numeracy (Class X level); and data interpretation (Class X level). It is unchanged from previous years.
Q2. What is the difficulty level of CSAT maths?
The numeracy and data-interpretation questions are officially of Class X (10th standard) level. You don't need advanced mathematics — but you do need conceptual clarity and speed, as recent papers have been calculation- and reasoning-intensive.
Q3. Is the CSAT syllabus changing for 2027?
No. The CSAT syllabus has remained the same since its introduction in 2011 and is unchanged for 2027. What has changed is the difficulty and the emphasis — comprehension and conceptual maths now dominate.
Q4. How many questions and marks are there in CSAT?
CSAT has 80 objective questions for 200 marks (2.5 marks each), to be done in 2 hours, with ⅓ negative marking. It is qualifying — you must score 33% (66.67 marks) — and its marks are not added to the Prelims merit.
Q5. Which CSAT topics are most important?
Comprehension (the largest section), the Number System and core arithmetic in maths, and high-frequency reasoning topics (syllogism, seating arrangement, blood relations, direction sense, analytical reasoning) carry the most weight and should be prioritised.
Key Takeaways
- 7 components: comprehension, interpersonal/communication skills, logical reasoning & analytical ability, decision-making & problem-solving, general mental ability, basic numeracy, and data interpretation.
- Pattern: 80 questions, 200 marks, ⅓ negative marking, 2 hours; qualifying at 33% (66.67), not counted in merit.
- Maths is Class X level — split into Basic Numeracy and General Mental Ability (arithmetic), with the Number System dominating.
- Reasoning has two parts — LR & AA and DI & DS — with syllogism, seating, blood relations & analytical reasoning appearing most.
- Prioritise smartly: comprehension, number system & core arithmetic, and high-frequency reasoning — and treat CSAT as a core paper given its rising difficulty since 2023.
- The syllabus is unchanged for 2027 — use it to map your gaps, then practise PYQs and timed mocks.
