The Combined Defence Services Examination is conducted by the UPSC for recruitment of Commissioned Officers in the Indian Military Academy, Officers Training Academy, Indian Naval Academy and Indian Air Force Academy.

Combined Defence Services Exam

The "Combined Defence Services" (CDS) Examination is conducted twice a year by the Union Public Service Commission (UPSC) for the recruitment of candidates into the Indian Military Academy, Officers Training Academy, Indian Naval Academy and Indian Air Force Academy. The UPSC will conduct the CDS exam twice a year in the month of February and September.

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Everything About CDS Exam


Candidates in the age group of 19-24 years both married and unmarried are eligible to appear for the written exam. Candidates should have a bachelor degree and must be citizen of India, subject of Nepal and Bhutan or Indians migrated to settle in India.

Exam Pattern

Candidates will have to answer 340 questions for English, General Knowledge, and Elementary Mathematics in 6 hours for 300 marks. For the CDS OTA exam, they will have to attempt 240 questions for General Knowledge and English in 4 hours for 300 marks


The syllabus for the written exam comprises subjects such as English, General Awareness, Mathematics for IAFA, IMA, and INA posts. For the OTA posts, the candidates will be screened based on their knowledge of the UPSC CDS syllabus for General Knowledge and English.

Course Benefits

Defence Academy always provides the best in the industry training, syllabus, previous years question papers and full online and offline support to our students to guarantee their success in the exams.

Video Lectures
Study Notes
Rank Analysis
Offline Access
Mock Tests
Exam Materials

Written Training

We provide full training in both offline and online mode in written aspect of these exams. We have brilliant fleet of extraordinary tutors to guarantee your success in defence exams. Our offline videos covering all subjects and various ways to clear the exams with flying colors. 

Physical & Psychometric

Covering physical and psychometric aspects of the exams is our another important goal. We have trainers and coaches who trains our students for their success. Each student is focused individually and we always try to make sure that they understand each and every point in both physical exams and interviews.

Meet Our Lead Instructors

We have brilliant in-house and visiting tutors who have immense knowledge and experience in defence exams and have been a part of defence forces or defence institutes

Colonel .M.J. Anand (Retd)

Geography and Current affairs faculty

Lt.Colonel Jayavel (Retd)

Senior SSB faculty. Trained group testing officer

Lt Cdr Vimalraj S (Retd)

GTO Faculty, Indian Navy as Short Service


Expert in handling Physics, Chemistry and Biology for class 6 to 12th std.  

Number Speaks


Indian Army


Indian Air Force


Indian Navy



What Our Students Have to Say

Defence Academy has been a life changing experience. All tutors and management is super freindly and have immense knowledge to help you prepare for Defence exams.
Indian Navy
I am super excited to describe my journey with DAC. Tanzeela mam was very helpful in motivating me and tutors were extra ordinary in helping me crack the exam.
Tharun Adithya
Sainik Exam
My parents are happy with what I achieved in my exam. I cleared with flying colors and all credit goes to Defence Academy Chennai. One of the best institute.
Its not easy to understand the exam pattern and the syllabus was huge together with my school exams. But, thanks to Surendran Sir and Defence Academy Chennai