CDS Syllabus: The Exam Structure, Explained
ConferenzaThe Combined Defence Services exam is the doorway to India's premier officer training academies. This page lays out the written exam by section, explains why the OTA route is a little different, and shows where the SSB interview fits in. It is a plain-English overview, not the official notification.
1What the exam tests
The written stage decides your SSB call. Its sections are the same three subjects, with one important exception.
1
English
Tests your command of the language: grammar, vocabulary, sentence correction, ordering, and reading comprehension. Every candidate sits this paper, whether they are aiming for a military, naval, air-force or OTA seat.
★ Universal · reliable scoring2
General Knowledge
A wide sweep across current affairs, history, geography, polity, economics, and general science. The reader who follows the news and knows their NCERTs quietly dominates this paper.
★ Wide · rewards daily reading3
Elementary Mathematics
Around matriculation level: arithmetic, algebra, trigonometry, geometry, and mensuration. Important note — this paper is required for the IMA, naval and air-force academies, but the OTA (Officers Training Academy) route does not include it.
★ High yield · skipped only for OTA4
SSB Interview
Clear the written cut and you are called to a multi-day Services Selection Board: screening, psychology tests, group testing tasks, a personal interview and the final conference. It looks for officer-like qualities, not textbook recall.
★ The real filter · prepare early2Focus here, avoid these
Where CDS aspirants gain an edge, and the traps that quietly cost marks.
Know your target academy
If OTA is your goal, plan around English and GK; if IMA, INA or AFA, give Elementary Maths equal weight from the start.
Build a GK routine
A daily newspaper plus NCERT history, geography and polity turns the widest section into your strongest one over time.
Do not assume every seat needs Maths
The OTA paper skips Elementary Mathematics, but the academy seats do not — check which route you are applying for before you plan your prep.
Do not blind-guess
The written papers carry negative marking, so reckless guessing works against you. Leave a question you cannot genuinely reason out.
3How to prepare
A four-phase arc you can stretch to fit the time you have.
- 1
Foundation
- Refresh matriculation-level maths and NCERT history, geography and polity.
- Fix your grammar basics and start reading in English daily.
- Checkpoint: you can work through basic problems and comprehension without hunting for rules.
- 2
Build
- Move to section-wise practice for each subject you need.
- Keep a running current-affairs and formula notebook.
- Checkpoint: a revision habit you return to weekly.
- 3
Mock & revise
- Attempt full-length timed papers and previous years' sets.
- Review each attempt for accuracy and time management.
- Checkpoint: your section order and pacing feel automatic.
- 4
SSB readiness
- Work on fitness, clear speaking and self-reflection.
- Understand officer-like qualities and current national issues.
- Checkpoint: you can discuss yourself and the news with calm confidence.
Tap to reveal.
Which three subjects can appear in the CDS written exam?Reveal
English, General Knowledge and Elementary Mathematics.
How is the OTA route different?Reveal
The OTA (Officers Training Academy) written exam does not include the Elementary Mathematics paper — it is English and General Knowledge only.
What is the final selection stage after the written exam?Reveal
The multi-day SSB interview: screening, psychology tests, group tasks, a personal interview and the conference.
Written by the Conferenza Study Desk to help aspirants, not to sell. This is a friendly overview, not the official document, and the exam pattern can change; always confirm the current syllabus and scheme on the official UPSC website and the latest CDS notification.
Practise the right way for CDS
Chapter-wise question banks, sample papers and workbooks for CDS — everything you need to turn understanding into marks.