Earn The
Commission.
The Combined Defence Services Exam is the gateway to India's prestigious military academies. Depending on your target (OTA vs IMA), prepare for a grueling 4-to-6 hour objective test covering English, GK, and Elementary Mathematics.
IMA vs OTA Paper Structure
Officers Training Academy (OTA) candidates are exempted from the Elementary Mathematics paper, making their total exam out of 200 marks instead of 300.
English
- Duration: 2 Hours
Synonyms/Antonyms, Error Spotting, Para Jumbles, Comprehension, Sentence Correction.
General Knowledge
- Duration: 2 Hours
Defense news, Current Affairs, Physics/Chem/Bio, History, Geography, Polity & Economics.
Elementary Math
- Duration: 2 Hours
Arithmetic, Algebra, Trigonometry, Geometry, Mensuration & Basic Statistics.
Cracking the CDS Code
Unlike Civil Services, CDS requires speed, accuracy, and endurance to sit through 6 hours of testing in a single day.
English is the
Rank Maker
Historically, out of the 100 marks, successful candidates consistently score 65-80 in English. It is highly scoring if rules of grammar and vocabulary are practiced exhaustively via PYQs.
GK is the
Eliminator
The GK paper is notoriously tough, often bordering on CSE prelims difficulty. Securing merely 20% sectional cutoff is hard for many. Focus heavily on Basic Sciences (30 Qs) and Defense News.
Math Demands
Tricks, Not Steps
Attempting 100 Math questions in 120 minutes gives ~1 minute per question. Conventional methods fail here. You must deploy unit digit methods, option elimination, and direct shortcut formulas.
Test Before You
Get Tested.
Select our specialized OTA track, or enroll in the complete IMA package covering Advanced Elementary Mathematics tests and tricks.
ExamBoost UPSC CDS OTA Special
Targeted practice for Officers Training Academy (OTA) - English & GK Only.
- 15 Full Length OTA Mock Tests (Eng + GK)
- 50 Sectional Tests (Vocab, History, GS)
- Last 7 Years PYQ Mocks
- Detailed Performance Analytics
- No Mathematics Tests
ExamBoost UPSC CDS Complete Foundation
The complete 3-Paper solution including Elementary Mathematics for IMA, INA, and AFA.
- 20 Full Length Mock Tests (Eng + GK + Math)
- 80 Sectional & Topic-wise Tests
- Math Short-Tricks Masterclasses
- SSB Screening (OIR) Practice

