The Combined Defence Services (CDS) examination, conducted by the Union Public Service Commission (UPSC), offers a prestigious avenue for graduates to join the Indian Military Academy (IMA), Indian Naval Academy (INA), Air Force Academy (AFA), and Officers’ Training Academy (OTA). If you hold a bachelor’s degree and harbor the ambition to serve as a Commissioned Officer in the Indian armed forces, understanding the nuances of the CDS exam is paramount. This comprehensive guide will walk you through the eligibility criteria, syllabus structure, and the selection process involved.
Are You Eligible? – Eligibility Criteria:
The eligibility criteria for the CDS exam vary slightly depending on the academy you are applying for:
- For Indian Military Academy (IMA) and Officers’ Training Academy (OTA):
- A degree from a recognized University or equivalent.
- For Indian Naval Academy (INA):
- A degree in Engineering from a recognized University/Institution.
- For Air Force Academy (AFA):
- A degree of a recognized University (with Physics and Mathematics at 10+2 level) or Bachelor of Engineering.
Note: Candidates appearing in the final year/semester of their degree examination can also apply, provided they can submit proof of passing the degree examination by the specified cut-off date.

What Will You Be Tested On? – Syllabus Structure:
The written examination for CDS comprises different papers based on the academy preference:
- For IMA, INA, and AFA:
- English: This paper assesses your understanding of English language, including grammar, vocabulary, comprehension, and composition. (Maximum Marks: 100)
- General Knowledge: This paper tests your awareness of current events, history, geography, basic science, and other areas of general awareness. (Maximum Marks: 100)
- Elementary Mathematics: This paper covers fundamental mathematical concepts up to the Class X level, including arithmetic, algebra, trigonometry, geometry, mensuration, and statistics. (Maximum Marks: 100)
- For Officers’ Training Academy (OTA):
- English: (Maximum Marks: 100)
- General Knowledge: (Maximum Marks: 100)
- Note: Elementary Mathematics is not a part of the written examination for OTA.
The Journey to Commission – Selection Process:
The CDS selection process is also a two-stage affair:
- Written Examination: Candidates meeting the eligibility criteria appear for the written examination conducted by UPSC. This is the initial screening phase.
- SSB Interview (Services Selection Board): Candidates who successfully clear the written examination are called for the SSB interview. Similar to the NDA process, the SSB assesses a candidate’s personality, officer-like qualities, and suitability for a career in the armed forces through a series of tests and interviews over a period of several days.
Different Paths, Same Goal:
The CDS exam offers multiple pathways to join the defence forces, catering to graduates from various academic backgrounds. Whether you aspire to lead infantry battalions, command naval vessels, pilot fighter jets, or train future officers, the CDS exam is your stepping stone. A thorough understanding of the eligibility criteria, the specific syllabus for your chosen academy, and the rigorous selection process is crucial for a focused and effective preparation strategy. Begin your preparation with clarity and determination to realize your ambition of serving the nation.