CDS is UPSC’s graduate entry for officers, decided by a written examination and a five-day SSB interview that carry equal weight. The first thing to settle is which papers you sit, because that depends on the academy you are aiming for.
The structure, from the official pattern
For the IMA, INA and AFA, three papers of 100 marks each, two hours per paper:
| Paper | Questions | Marks |
|---|---|---|
| English | 120 | 100 |
| General Knowledge | 120 | 100 |
| Elementary Mathematics | 100 | 100 |
For the Officers Training Academy (OTA), only English and General Knowledge are taken, for 200 marks — there is no Mathematics paper. Every paper deducts one third of the marks for a wrong answer. The SSB interview carries 300 marks (200 for OTA), equal to the written.
Play to the paper that scores
- Elementary Mathematics is Class 10 level, which makes it the most scoring paper for IMA/INA/AFA candidates. Master arithmetic, algebra, trigonometry, geometry and mensuration and aim for a high, accurate score. Build it through percentage, profit and averages, time, speed, distance and work and mensuration, mixtures and counting.
- General Knowledge is broad and graduate-level — history, polity, geography, economy, general science and defence-flavoured static GK. Build it steadily using general awareness for railway and SSC and a daily current-affairs habit.
- English rewards a little practice each day — vocabulary, grammar, error spotting and comprehension. Use error spotting and sentence correction and reading comprehension.
OTA aspirants who skip Mathematics must push English and GK harder, since only two papers decide the written score.
Respect the negative marking, then the SSB
With one-third negative marking in every paper, attempt what you are sure of and leave the rest — the arithmetic is in negative marking strategy. And because the SSB carries as many marks as the written exam, begin fitness, reasoned self-expression and current-affairs awareness early rather than waiting for the written result.
A workable plan
- For officer-academy candidates, make Elementary Mathematics your reliable scoring paper, and build GK and English as the broader, slower tracks.
- Keep a daily current-affairs habit through the cycle — see how to prepare current affairs.
- Sit timed, full-length OMR mocks for the papers you will take.
- Run a fitness and SSB track in parallel, and structure the whole with how to build a study plan.
Practice that transfers
Rehearse under real conditions. Take the CDS mock tests and full details on the exam page, keep General Knowledge current with the daily quiz, and drill Mathematics and English through their linked practice sets so every paper you sit is familiar before exam day.
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Frequently asked questions
What is the difference between the CDS IMA/INA/AFA and OTA papers?
Candidates for the IMA, INA and AFA sit three papers — English, General Knowledge and Elementary Mathematics — for 300 marks, leading to a permanent commission. OTA candidates sit only English and General Knowledge for 200 marks, leading to a short service commission, with no Mathematics paper. Which papers you take depends entirely on the academy you are applying for.
Which is the most scoring CDS paper?
Elementary Mathematics, for IMA, INA and AFA candidates. It is only at the Class 10 level, so with steady practice of arithmetic, algebra, trigonometry, geometry and mensuration it is the paper where a high, accurate score is most achievable. English and General Knowledge are at the graduate level and reward broader, longer preparation.
How is CDS negative marking applied?
One third of the marks assigned to a question is deducted for each wrong answer, in every paper. Unattempted questions carry no penalty, so attempt the questions you are reasonably confident about and leave genuine blanks rather than guessing across the whole paper.
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