UPSC CDS Exam: Pattern, Syllabus, SSB Interview & Eligibility

The Combined Defence Services examination is conducted by the Union Public Service Commission twice a year, and a single application can be made to more than one academy. The four destinations are the Indian Military Academy at Dehradun for the Army, the Indian Naval Academy at Ezhimala for the Navy, the Air Force Academy at Hyderabad, and the Officers Training Academy at Chennai.

The first three lead to a permanent commission, while OTA leads to a short service commission, which can later be extended or converted under service rules. OTA also has a women's entry, which is why a large share of women candidates in the defence stream write CDS through this route.

The practical difference for preparation is the paper count. IMA, INA and AFA candidates write three papers; OTA candidates write two. A candidate weak in mathematics but strong in English and General Knowledge can apply to OTA alone and skip the Mathematics paper entirely, which is a legitimate and common strategy.

Because CDS is a graduate entry, the competition differs from NDA, which is taken after Class 12. The syllabus is broader, the English standard is higher, and candidates typically arrive with a degree already in hand.

Every paper is objective, runs for two hours, and carries 100 marks. Negative marking of one-third of a question's marks applies.

Read the second column carefully. For OTA candidates, General Knowledge is half the entire written examination. Even for academy candidates it is a third. No other graduate-level defence entry gives General Knowledge this much weight.

The General Knowledge paper covers current events of national and international importance, Indian history and the freedom movement, geography, Indian polity and the Constitution, economics, general science at school level, and defence-related awareness. Questions are direct and factual rather than analytical, which makes the section reward revision more than reasoning.

The English paper tests comprehension, spotting errors, sentence improvement, synonyms and antonyms, ordering of words and sentences, fill in the blanks and idioms — a standard competitive English syllabus, but pitched at graduate level and asked in volume.

Elementary Mathematics covers arithmetic, algebra, trigonometry, geometry, mensuration and statistics at roughly Class 10 level. It is the most predictable paper of the three, and academy candidates should treat it as the safest place to secure marks.

Candidates who clear the written stage are called for the Services Selection Board assessment, and its weight is what surprises most first-time candidates. For the academy entries the SSB has carried 900 marks against a 300-mark written test, while for OTA it has carried 300 marks against a 200-mark written test. Either way, the interview stage is worth at least as much as everything you studied for. Confirm the exact marks from the notification for your cycle.

The assessment runs over about five days in two stages. Stage 1 is a screening test on the first day, combining an Officer Intelligence Rating test with the Picture Perception and Description Test; a large share of candidates are screened out here and return the same day. Stage 2 covers psychological tests, group testing tasks run by the Group Testing Officer, a personal interview, and a final conference where the board decides.

What the board looks for is officer-like qualities rather than knowledge — reasoning under pressure, initiative, cooperation inside a group, and the ability to state and defend a decision clearly. It cannot be crammed, but format familiarity removes a great deal of avoidable disadvantage, and candidates who walk in having never seen a GTO task lose ground for no good reason.

A medical examination follows, and the standards are strict. Check them before investing a year in this exam rather than after clearing the SSB.

Nationality and degree requirements differ by academy, so read this section against the academy you intend to apply for.

Marital status rules also differ: the academy entries have generally required candidates to be unmarried, while the OTA women's entry and certain categories have their own provisions. Age bands, marital status conditions and the exact degree requirements are revised between cycles, so treat this table as orientation and verify every line from the current notification.

Final-year students may usually apply subject to producing proof of passing by the prescribed date. Physical and medical standards apply at the SSB stage for all streams.

Decide your academy first, because it decides your syllabus. An OTA-only candidate should put every hour into English and General Knowledge; an IMA or INA candidate has to carry Mathematics as well.

For General Knowledge, build the static base before chasing current affairs. The NCERT foundation in history, polity, geography, economics and science from Class 6 to 12 covers most of what is asked, and it repeats across years. Layer six months of current affairs on top, and keep a one-page defence sheet — ranks, commands, exercises, indigenous equipment and recent inductions — because CDS asks defence questions that other exams do not.

For English at 100 marks, the returns are the highest per hour of any section here. Grammar worked through one book completely, a fixed daily vocabulary list, and timed comprehension practice will move this score more reliably than anything else.

For Elementary Mathematics, work from Class 9 and 10 textbooks and then move to timed practice sets. Accuracy first because of the negative marking, then speed.

Treat the SSB as part of preparation from the start rather than something that begins after the result. Reading about the group tasks, practising the reasoning batteries and being able to speak clearly about your own choices costs a few weekends and matters at a stage worth hundreds of marks.

The General Studies base built here transfers directly to UPSC NDA and SSC CGL, and the awards and defence topics overlap with our Indian Awards and Honours notes. For a structured foundation, see the Crazy GkTrick course catalogue.