UPSC CDS Syllabus 2026 — The Written Exam Is Just the Beginning
The UPSC CDS exam has two distinct phases: the written examination conducted by UPSC, and the Service Selection Board (SSB) interview. Most candidates focus only on the written exam — but understanding both phases from the start is what separates those who get recommended from those who don't. Here is the complete breakdown.
Written Exam — Two Different Patterns for Different Academies
The written test differs depending on which academy you apply for. Applying for IMA, INA, or AFA means three papers. Applying for OTA means only two papers — Mathematics is not required for OTA.
| Paper | Questions | Marks | Duration | Applicable To |
|---|---|---|---|---|
| English | 120 | 100 | 2 hours | IMA / INA / AFA / OTA |
| General Knowledge | 120 | 100 | 2 hours | IMA / INA / AFA / OTA |
| Elementary Mathematics | 100 | 100 | 2 hours | IMA / INA / AFA only |
| IMA/INA/AFA Total | 300 | 300 | 6 hours | |
| OTA Total | 200 | 200 | 4 hours |
English Paper — What Actually Gets Asked
The English paper (120 questions, 100 marks) covers a predictable set of question types that repeat year after year. The key areas with their typical weightage:
- Spotting Errors (15–20 questions): Identifying grammatical errors in underlined portions of sentences. Subject-verb agreement, tense errors, and preposition misuse are the most common.
- Fill in the Blanks (10–15 questions): Vocabulary-based; also tests idioms and prepositions in context.
- Ordering of Sentences (10–15 questions): Arrange jumbled sentences into a coherent paragraph. Tests logical sequencing.
- Synonyms and Antonyms (10 questions): Standard vocabulary. Focus on formal/literary words at Class 11–12 level.
- Reading Comprehension (20–25 questions): 2–3 passages on general topics. Questions test main idea, inference, and vocabulary in context.
- Idioms and Phrases (5–10 questions): Meaning and usage of standard English idioms.
General Knowledge Paper — Where Defence GK Matters
GK (120 questions, 100 marks) covers a broad range of topics but has a notable defence-specific component that many civilian coaching programs ignore:
- Current Events (20–25 questions): Last 6–8 months of national and international news. Government schemes, appointments, summits, and border-related developments.
- History and Culture (15–20 questions): Ancient, Medieval, and Modern Indian History. Freedom struggle figures, treaties, and battles.
- Geography (15 questions): Physical geography of India, rivers, mountain ranges, passes, and world geography.
- Polity and Economy (10–15 questions): Constitutional articles, government schemes, budget highlights.
- General Science (10–15 questions): Physics, Chemistry, Biology at Class 10 level.
- Defence-Specific GK (10–15 questions): Names of military operations, India's defence equipment, joint exercises with other countries, military ranks, nuclear and missile programme. This section is your differentiator — civilian coaching programs rarely cover it.
Mathematics Paper (IMA/INA/AFA) — Level and Strategy
The Maths paper (100 questions, 100 marks) is based on Class 10 NCERT level. Topics and approximate question count:
| Topic | Approx. Questions |
|---|---|
| Number System, HCF, LCM | 5–8 |
| Algebra (Equations, Polynomials) | 10–15 |
| Trigonometry | 10–15 |
| Geometry (Lines, Triangles, Circles) | 15–20 |
| Mensuration (Area, Volume) | 10–12 |
| Statistics and Probability | 8–10 |
| Ratio, Proportion, Profit/Loss, Time-Work | 15–20 |
Recommended Books — What Toppers Use
Based on consistent recommendations from CDS qualifiers and SSBCrack forums:
| Paper | Recommended Books |
|---|---|
| English | Wren & Martin (grammar basics); Previous year papers (UPSC official); Word Power Made Easy — Norman Lewis |
| General Knowledge | Lucent's GK; Manorama Yearbook (current); NCERT History/Geography (Class 9–12); Defence GK — Pathfinder CDS (Arihant) |
| Mathematics | NCERT Class 9–10 Maths; RS Aggarwal (Elementary Maths); Pathfinder CDS Maths (Arihant) |
| SSB Preparation | SSBCrack — Let's Crack SSB Interview (Cdr. Natarajan); The Complete Guide to SSB Interview (Arihant) |
Approximate Cut-off Scores — What You Need to Target
UPSC does not officially publish CDS cut-off scores. Based on disclosed results and informed estimates from coaching analysis, the approximate written exam shortlisting scores are:
| Academy | Approx. Cutoff | Note |
|---|---|---|
| IMA (300 marks) | ~95–115 | Varies by year and vacancies |
| INA (300 marks) | ~100–120 | Engineering-only pool, tighter competition |
| AFA (300 marks) | ~85–105 | Fewer vacancies; strict medical filters many out |
| OTA (200 marks) | ~65–80 | Larger vacancies, relatively lower written cutoff |
Approximate Cut-off Scores — What You Need to Target
UPSC does not officially publish CDS cut-off scores. Based on disclosed results and informed estimates from coaching analysis, the approximate written exam shortlisting scores are:
| Academy | Approx. Cutoff | Note |
|---|---|---|
| IMA (300 marks) | ~95–115 | Varies by year and vacancies |
| INA (300 marks) | ~100–120 | Engineering-only pool, tighter competition |
| AFA (300 marks) | ~85–105 | Fewer vacancies; strict medical filters many out |
| OTA (200 marks) | ~65–80 | Larger vacancies, relatively lower written cutoff |
Previous Year Paper Analysis — Repeating Patterns
UPSC CDS papers follow consistent patterns across years. Based on analysis of past papers:
- English: Spotting errors and ordering of sentences together account for 35–40% of the English paper. Comprehension passages are typically 400–500 words from non-technical topics like environment, history, or society.
- GK: Approximately 20–25 questions come from current events of the preceding 6 months. History (especially Modern India and Freedom Struggle) consistently gets 15–18 questions. Defence-specific GK appears in 8–12 questions every year.
- Maths: Geometry and Mensuration together contribute 25–30 questions. Trigonometry is high-weightage (10–15 questions) — sin, cos, tan values and identities at Class 10 level are sufficient.
UPSC releases official previous year papers on its website — solve at least the last 5 years' papers under timed conditions. This is more effective than any coaching material because the question style, difficulty, and traps are exactly what you will face on exam day.
After SSB — Medical, Merit List, and Joining Timeline
If recommended at SSB, the process continues: Medical examination at a designated Military Hospital (1–3 days), followed by a wait for the UPSC merit list (published 4–6 months after the exam). After merit list publication, joining letters are issued with a reporting date at the respective academy. The complete timeline from exam date to academy joining is typically 8–14 months. Candidates should not resign from their current job or course until they receive a confirmed joining letter.
Q: Is there negative marking in CDS?
Yes — 1/3 mark is deducted for each wrong answer. Do not guess blindly. If you can eliminate 2 of 4 options, attempting the question is mathematically worthwhile. If you have no idea, skip it.
These are written exam SSB shortlisting cutoffs — not final selection scores. Final merit after SSB and medical is far more competitive. Targeting 130+ for IMA/INA and 90+ for OTA gives a safe buffer. The CDS II 2026 exam is on 14 September 2026 — candidates applying now have 4 months to prepare.
These are written exam SSB shortlisting cutoffs — not final selection scores. Final merit after SSB and medical is far more competitive. Targeting 130+ for IMA/INA and 90+ for OTA gives a safe buffer. The CDS II 2026 exam is on 14 September 2026 — candidates applying now have 4 months to prepare.
Time Management Strategy — 3 Papers in One Day
On exam day, all three papers are written on the same day with breaks. This is mentally exhausting. Experienced candidates use these strategies:
- English first (morning): Most candidates find English the least draining — starting with it preserves mental energy for Maths and GK later.
- Maths — attempt sure questions first: With 100 questions in 120 minutes, you have 1.2 minutes per question. Skip uncertain questions, mark them, and return. Do not waste time on one question for more than 90 seconds.
- Negative marking rule: Never guess if you have zero idea. But if you can eliminate 2 options, attempting the remaining 2 gives a net expected score of +0.25, which is worth it.
- GK — current events last: Recent events questions require fresh recall. Tackle static GK (History, Geography) before current events to avoid confusing recently read facts.
How Many Attempts Do You Actually Have?
UPSC does not cap the number of CDS attempts. Your only constraint is age. For IMA (19–24 years), if you graduate at 22, you have only 2 attempts before aging out. For OTA (19–25 years), you have 3–4 realistic attempts after graduation. This makes it critical to start preparation in the 2nd or 3rd year of graduation rather than after it. CDS II 2026 exam date is 14 September 2026 — candidates who start preparing now (May 2026) have exactly 4 months, which is sufficient for a disciplined first attempt.
There is no calculus in CDS Maths. The difficulty level is moderate — a well-prepared student who is comfortable with Class 10 NCERT can score 70+ out of 100 with practice. Maths is the most practice-driven paper — time management and formula recall matter more than conceptual depth.
Preparing for Both Written Exam and SSB Simultaneously
Most candidates make the mistake of preparing for SSB only after clearing the written exam. This is a critical error. SSB preparation — reading, journalling, building self-awareness, staying physically fit, and understanding current affairs from a defence perspective — is a 6–12 month process. Starting SSB preparation 3 months before the written result is announced is too late for most people.
The recommended approach: prepare for both in parallel. Spend 80% of study time on the written exam (English, GK, Maths) and 20% on SSB foundations — reading newspapers critically, maintaining a journal, and doing physical training. SSB is ultimately an assessment of who you are, not what you know — and character takes time to build.
Negative marking: 1/3 mark is deducted for every wrong answer. No deduction for unattempted questions.
Subject-Wise Syllabus
English (100 marks) — Tests grammar, vocabulary, comprehension, and sentence correction. The level is Class 10+2. Questions cover spotting errors, fill in the blanks, synonyms/antonyms, idioms and phrases, ordering of sentences, and reading comprehension.
General Knowledge (100 marks) — Current events, history, geography, economics, general science, polity, and defence-related topics. Defence GK (names of operations, military equipment, border disputes, recent exercises) carries significant weight and is often ignored by first-time candidates.
Elementary Mathematics (100 marks — IMA/INA/AFA only) — Number system, algebra, trigonometry, geometry, mensuration, statistics, and probability. The level is Class 10. No calculus. The Maths paper is often the differentiator between candidates shortlisted for IMA/INA/AFA versus those who score well on only English and GK.
SSB Interview — 5 Days, 5–10% Selection Rate
Clearing the written exam is just an entry ticket to SSB. The real filter is the Service Selection Board (SSB) interview — a rigorous 5-day residential assessment that evaluates your Officer Like Qualities (OLQs), psychological fitness, and leadership potential.
Day 1 — Stage I Screening (go/no-go):
- Officer Intelligence Rating (OIR): Verbal and non-verbal reasoning tests. A basic intelligence filter.
- Picture Perception & Description Test (PPDT): You view a blurry picture for 30 seconds and write a story, then narrate it in a group discussion. Assessors look for leadership, initiative, and how you handle disagreement.
Only those who clear Stage I proceed to Stage II. Roughly 40–60% of candidates are screened out on Day 1.
Days 2–5 — Stage II (full assessment):
- Psychological Tests: TAT (Thematic Apperception Test — stories from ambiguous images), WAT (Word Association Test — respond to 60 words in 15 seconds each), SRT (Situation Reaction Test — written responses to 60 situations in 30 minutes), SD (Self Description — write about yourself from the perspective of parents, teachers, friends, and yourself)
- Group Testing Officer (GTO) Tasks: Group Discussion (2 rounds), Group Planning Exercise (GPE), Progressive Group Task (PGT), Half Group Task (HGT), Individual Obstacles (10 tasks timed), Command Task (lead a group of subordinates), Final Group Task (FGT)
- Personal Interview (PI): Conducted by a senior officer over 45–60 minutes. Tests your knowledge of current affairs, self-awareness, and why you want to join the armed forces.
- Conference (Day 5): Final board discussion on your candidature. A last chance for the assessors to unanimously recommend or not recommend you.
The SSB success rate is approximately 5–10% of those called. Of all CDS written exam qualifiers across the country, the final selection rate (written + SSB + medical) is even lower. This is why mental preparation for SSB is as important as written exam preparation.
Medical Examination
Candidates recommended by SSB undergo a medical examination at a designated Military Hospital. The medical standards are strict, especially for AFA (Air Force Academy). Colour blindness, poor uncorrected vision (for AFA), and structural deformities are disqualifying. Medical re-evaluation is possible for borderline cases at AFMSF (Armed Forces Medical Services Facilities).
