The NDA exam (National Defence Academy) is a national entrance test conducted by UPSC twice a year. Unmarried candidates aged 16.5 to 19.5 who have passed Class 12 can apply to join the Indian Army, Navy or Air Force. CDS and AFCAT are the graduate-level entry routes into the Indian Armed Forces.
The NDA exam is the earliest entry point into a military career in India. UPSC notifies the NDA exam twice a year (NDA I and NDA II). The NDA written test covers Mathematics (300 marks) and a General Ability Test (600 marks), totalling 900 marks. Candidates who clear the NDA written round proceed directly to SSB.
According to UPSC’s official NDA II 2024 notification, roughly 4 lakh candidates applied for approximately 400 vacancies across the three services. That is a selection ratio of about 0.1%, which shows how competitive the NDA exam really is.
To appear for the NDA exam, candidates must be unmarried Indian nationals aged between 16.5 and 19.5 years. For the Army wing, Class 12 pass in any stream is sufficient. For the Navy and Air Force wings, Physics, Chemistry and Mathematics (PCM) at Class 12 are mandatory. Female candidates have been eligible for the NDA exam since UPSC’s November 2021 notification, following a Supreme Court order.
The NDA exam syllabus has two papers. Paper I is Mathematics (300 marks) covering algebra, matrices, trigonometry, calculus, statistics and probability. Paper II is the General Ability Test (600 marks) split into English (200 marks) and General Knowledge (400 marks), which includes Physics, Chemistry, General Science, History, Geography and Current Events. Total NDA written exam marks: 900. SSB carries an additional 900 marks, making the combined total 1800.
The CDS exam (Combined Defence Services) is also conducted by UPSC, twice a year. It is the graduate-level route into the Indian Military Academy (IMA), Officers Training Academy (OTA), Indian Naval Academy (INA) and Air Force Academy (AFA). The written test has three papers: English, General Knowledge and Elementary Mathematics, each carrying 100 marks. OTA candidates skip Mathematics.
CDS sits in a different competitive bracket from exams conducted by SSC, RRB or IBPS, because final selection depends on SSB performance combined with the written score, not merit rank alone.
AFCAT stands for Air Force Common Admission Test. Unlike the NDA exam and CDS, it is not conducted by UPSC; the Indian Air Force runs it directly, twice a year. It selects candidates for Flying Branch, Ground Duty Technical and Ground Duty Non-Technical branches.
The AFCAT written test is 100 questions, 300 marks, covering Verbal Ability, Numerical Ability, Reasoning and Military Aptitude. Candidates aiming for the Flying Branch also sit the Engineering Knowledge Test (EKT). According to the Indian Air Force’s official recruitment portal, AFCAT 2024 saw over 2.5 lakh registrations for a few hundred vacancies.
Eligibility is where many students trip up. Age limits and educational qualifications differ sharply across the three exams, and the Ministry of Defence updates them with each notification cycle. Always check the current official notification on the UPSC or Indian Air Force website before applying.
| Exam | Conducting Body | Minimum Qualification | Age Range | Gender |
|---|---|---|---|---|
| NDA | UPSC | Class 12 (PCM for Navy/Air Force) | 16.5 to 19.5 years | Male and Female (unmarried) |
| CDS (IMA/INA/AFA) | UPSC | Degree (Engineering for Navy/Air Force) | 19 to 24 years (varies by academy) | Male |
| CDS (OTA) | UPSC | Any Degree | 19 to 25 years | Male and Female |
| AFCAT | Indian Air Force | Graduation (60% aggregate; PCM at 10+2) | 20 to 24 years (Flying); up to 26 years (Ground Duty) | Male and Female |
If you are still in Class 12 and mapping out your options, the best career paths after 12th grade guide on 3University covers government and private sector routes side by side, which helps put defence careers in context.
Preparing for the NDA exam requires a structured approach across two fronts: the written test and the SSB. For the written test, candidates should focus on NCERT Mathematics up to Class 12, current affairs from the past 12 months, and English grammar and comprehension. Solving previous years’ NDA exam papers is the single most effective preparation strategy, as the question pattern is consistent across cycles.
For SSB preparation, start building Officer Like Qualities (OLQs) well before your SSB date. Join debate clubs, take on leadership roles in college, read newspapers daily and practise group discussions. The SSB cannot be cracked through rote study; it rewards genuine experience and self-awareness.
Students who want to add a technical edge to their defence career preparation can explore ISRO free online courses with certificate — these are relevant for candidates targeting DRDO, ISRO or technical branches of the armed forces.
Clearing the NDA exam or CDS written test gets you a call letter for the SSB. This is where most candidates, even well-prepared ones, do not make it through. The Services Selection Board runs a structured five-day assessment that tests far more than academic knowledge.
Day one involves the Officer Intelligence Rating (OIR) test and a Picture Perception and Description Test (PPDT). Candidates who do not clear Stage 1 are sent home the same evening. According to the Ministry of Defence’s published SSB assessment guidelines, typically only 40-60% of candidates advance past Stage 1 to the full five-day process.
The SSB evaluates 15 Officer Like Qualities (OLQs), including effective intelligence, reasoning ability, social adaptability and courage. Candidates who attempt SSB multiple times consistently report that genuine leadership experience matters far more than rehearsed answers.
For students interested in technology-driven defence and intelligence careers, cybersecurity skills are increasingly valued across government agencies and the armed forces. Explore companies hiring fresh cybersecurity graduates to understand where those skills translate into civilian and government roles.
A commissioned officer starts at the rank of Lieutenant (Army), Sub-Lieutenant (Navy) or Flying Officer (Air Force). As per the 7th Pay Commission report, the basic pay for a Lieutenant starts at Rs. 56,100 per month, with Military Service Pay of Rs. 15,500 and various allowances on top. The total in-hand package, including HRA, DA and kit maintenance, typically crosses Rs. 80,000-90,000 per month for a fresh officer, according to the official Ministry of Defence pay matrices.
This places a defence officer’s starting compensation well above many entry-level private sector roles. For a broader comparison, the highest paid professions in India breakdown on 3University is a useful reference.
Students who want to combine a defence career with technical expertise often pursue certifications in cybersecurity or AI alongside their SSB preparation. The cybersecurity course eligibility guide at 3University explains what qualifications you need to start building those skills right now.
If you are still figuring out your overall direction, the career planning guide for Class 12 and college students walks through how to evaluate government, private and entrepreneurial paths without locking yourself into one lane too early.
The bottom line: the NDA exam is your door if you are in Class 12 and committed early. CDS and AFCAT are the graduate routes, each with different branch options. The SSB is the real filter, and it rewards people who have actually led, worked in teams and thought under pressure. Start building those qualities now, not the week before your SSB date.
If you want to add a technical edge to any of these career paths, explore 3University’s online certification courses in Cybersecurity, Ethical Hacking, AI, Blockchain and Web3 — practical, industry-recognised programmes designed for students and career switchers who want skills that hold up in the real world.
The NDA exam is a national entrance test for joining the Indian Army, Navy or Air Force after Class 12. It is conducted by the Union Public Service Commission (UPSC) twice a year. Candidates must be unmarried, aged 16.5 to 19.5 years, and must have passed Class 12 with Physics, Chemistry and Mathematics for the Navy and Air Force wings.
The NDA exam age limit is 16.5 to 19.5 years. Candidates must be unmarried Indian nationals. Class 12 in any stream qualifies for the Army wing; PCM is mandatory for the Navy and Air Force wings. Female candidates have been eligible for the NDA exam since November 2021 following a Supreme Court ruling.
CDS is the Combined Defence Services exam, also conducted by UPSC, targeting graduates who want a commissioned officer’s career. Eligibility varies by academy: IMA and INA require an engineering or science degree, while OTA accepts any graduate. Age limits range from 19 to 25 years depending on the academy applied for.
AFCAT (Air Force Common Admission Test) is conducted directly by the Indian Air Force, not UPSC. It selects officers for Flying, Ground Duty Technical and Ground Duty Non-Technical branches. Candidates need a graduation degree with at least 60% aggregate and PCM at Class 12 level. Age eligibility ranges from 20 to 26 years depending on the branch.
The SSB (Services Selection Board) is a five-day assessment that all defence candidates attend after clearing their written exam, including the NDA exam. It includes psychological tests, group tasks, a personal interview and a final conference. The board evaluates 15 Officer Like Qualities and cannot be prepared for through rote study alone.
Yes. Following a Supreme Court order in 2021, female candidates can apply for the NDA exam. Women can also apply for CDS (OTA) and AFCAT (Ground Duty branches). Always check the current official notification from UPSC or the Indian Air Force for the latest gender-specific vacancy details.
Last updated: September 2026. Reviewed by the 3University editorial team.
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