NDA Exam — The Complete Guide to Joining the National Defence Academy
The Union Public Service Commission's NDA examination is the youngest door into a permanent commission in the Indian Armed Forces. Class XII students walk through it. Four years later, they wear stars. This is the full picture — eligibility, papers, the SSB, the medical, and the road from cadet to Lieutenant.
1. What the National Defence Academy actually is
The National Defence Academy is a joint-services pre-commission training institution located at Khadakwasla, near Pune, in the state of Maharashtra. Established in 1954, it is the first tri-service academy in the world — cadets bound for the Indian Army, Indian Navy and Indian Air Force live, study and train on the same campus, side by side, for the same three years.
Admission is through the NDA & NA Examination conducted by the Union Public Service Commission (UPSC) twice each year — typically once in April (NDA-I) and once in September (NDA-II). The examination consists of a written paper followed by the 5-day Services Selection Board (SSB) interview and a Special Medical Board.
After 3 years at NDA, cadets graduate with a Bachelor's degree (BSc/BSc Computer Science/BA, depending on stream) from Jawaharlal Nehru University, and then proceed to a 1-year service-specific academy: Indian Military Academy (IMA), Dehradun for Army; Indian Naval Academy (INA), Ezhimala for Navy; Air Force Academy (AFA), Dundigal for Air Force. They commission at the end of that fourth year as a Lieutenant (Army), Sub-Lieutenant (Navy) or Flying Officer (Air Force).
2. Eligibility — the cutoffs that matter
Eligibility is rigorous and the cutoffs are unforgiving. UPSC will not waive an age or qualification requirement — read these carefully against the exact dates in the official notification for your chosen exam cycle.
An Indian citizen, or a subject of Bhutan or Nepal, or a Tibetan refugee who came to India before 1 January 1962, or a person of Indian origin migrated from specific listed countries — full list and certificate requirements in the UPSC notification.
Candidates must be between 16.5 and 19.5 years of age on the cut-off date specified for the exam (typically the first day of training, i.e. 1 January or 1 July of the relevant year). The cut-off is strict — even a one-day overage disqualifies.
For the Army wing: 10+2 (Class XII) or equivalent from a recognised board. For Air Force, Navy and Naval Academy 10+2 Cadet Entry: 10+2 with Physics, Chemistry and Mathematics. Candidates appearing in the Class XII final exam can also apply, subject to producing the certificate before joining NDA.
Unmarried. A candidate who marries between application and joining the Academy is ineligible to continue.
Both male and female candidates are eligible. Female candidates became eligible from NDA-II 2021 following the Supreme Court interim order in Kush Kalra v. Union of India (August 2021). The first batch of female cadets joined NDA in 2022.
As per the Special Medical Board (SMB) standards laid down by the Director General of Medical Services (DGMS). Minimum height standards vary slightly by region of origin (lower minimums for candidates from north-eastern states, hill areas etc.) and by service. Vision standards differ by service (strictest for Air Force pilot stream).
Women in NDA — the legal history. Until 2021 the NDA was a men-only institution. The Supreme Court in Kush Kalra v. Union of India (interim order dated 18 August 2021) held that gender-based exclusion from NDA was prima facie unconstitutional. UPSC opened the NDA-II 2021 examination to women. The first female cadets joined NDA in the 148th course (entry 2022). Source: UPSC notification & Supreme Court of India.
3. The two stages — written and SSB
NDA selection is a two-gate process. Each gate carries 900 marks. You must pass both, and then the medical, and then your aggregate rank must be inside the vacancy notified for your service preference and category.
- 900 marks total, objective (MCQ)
- Paper I — Mathematics (300, 2.5 h)
- Paper II — General Ability Test (600, 2.5 h)
- Conducted twice yearly: April & September
- Negative marking applies (per UPSC notification)
- Centres across all major Indian cities
- 900 marks total, 5-day residential assessment
- At one of four Selection Centres
- Day 1: Screening (OIR + PPDT)
- Day 2: Psychological tests (TAT/WAT/SRT/SD)
- Day 3–4: GTO tasks + Personal Interview
- Day 5: Conference & recommendation
4. The written exam in depth
Paper I — Mathematics (300 marks · 2.5 hours)
Drawn from the standard Class XI–XII CBSE/state-board syllabus. The UPSC-notified topics are:
- Algebra — sets, relations, complex numbers, quadratic equations, sequences and series, permutations and combinations, binomial theorem, logarithms
- Matrices and Determinants
- Trigonometry — identities, inverse functions, properties of triangles, heights and distances
- Analytical Geometry — 2D and 3D — straight lines, conic sections, planes
- Differential Calculus — limits, continuity, derivatives, applications
- Integral Calculus and Differential Equations
- Vector Algebra
- Statistics and Probability
Paper II — General Ability Test (600 marks · 2.5 hours)
Two parts, weighted as follows per the UPSC notification:
Grammar and usage, vocabulary, comprehension, cohesion. Tests the standard of English required of a commissioned officer.
Physics, Chemistry, General Science, History, Geography, Current Events. Approximate weighting (UPSC indicative): Physics 100, Chemistry 60, General Science 40, History 80, Geography 80, Current Events 40.
Negative marking. UPSC deducts marks for wrong answers — typically one-third of the marks allotted to that question. Refer the live notification for exact figures in your cycle. Strategy: do not guess blind. Eliminate options and answer when you can rule out at least two.
5. Cutoff trends — what scores actually clear
UPSC publishes both the written cutoff and the final (written + SSB) cutoff for each NDA exam, after the recommendation list is released. These figures are public on upsc.gov.in. The historical range (general category, illustrative — always verify against the live UPSC results page) sits roughly in this band:
Source: UPSC NDA & NA Examination results, last several cycles. Refer the specific year's notification & result PDF on upsc.gov.in for exact published cutoffs and minimum qualifying marks per subject.
6. The SSB Interview — five days that decide everything
Clearing the written gets you to the SSB. The SSB itself is a 900-mark, 5-day residential assessment held at one of four Services Selection Centres. The selection centre you report to depends on your service preference and the SSB you are called for:
Day 1 — Screening
The first day removes ~50–70% of reporting candidates. Two components:
- Officer Intelligence Rating (OIR) — two short verbal and non-verbal reasoning tests.
- Picture Perception and Discussion Test (PPDT) — a hazy picture is shown for 30 seconds. Candidates write a brief story, then a group of ~15 candidates discusses their individual stories and attempts to arrive at a common narrative. Assessors observe communication, dominance, listening and cooperation.
Candidates who do not clear screening leave the same evening. Those who clear are formally entered into the assessment.
Day 2 — Psychological tests
Four written tests, administered back-to-back by the psychologist:
- TAT — Thematic Apperception Test. 11 pictures + 1 blank slide. Write a short story for each in 4 minutes.
- WAT — Word Association Test. 60 words, 15 seconds each. First-instinct sentence.
- SRT — Situation Reaction Test. 60 short scenarios, 30 minutes total. Write what you would do.
- Self-Description (SD) — write what your parents, teachers, friends, and you yourself would say about you. ~15 minutes.
Day 3 & Day 4 — GTO tasks + Personal Interview
The Group Testing Officer (GTO) runs the outdoor and indoor team tasks across two days. Personal interview with the Interviewing Officer (IO) runs in parallel — typically 40–90 minutes one-on-one. GTO tasks include:
- Group Discussion (two topics, ~20 min each)
- Group Planning Exercise (GPE) — a written situation, group plan, group narration
- Progressive Group Task (PGT) — outdoor obstacle structures with helping material
- Half Group Task (HGT) — smaller group, same idea
- Individual Obstacles (IO) — 10 obstacles, 3 minutes
- Command Task — each candidate gets to lead
- Snake Race / Group Obstacle Race
- Lecturette — 3-minute solo talk on a chosen topic
- Final Group Task (FGT) — closing obstacle
Day 5 — Conference
All three assessors — Psychologist, GTO, IO — sit with the President and Deputy President of the Board. The candidate enters, answers a few questions, leaves. The board votes. The result is read out in the afternoon. Recommended candidates proceed to medical the next day.
The SSB framework is built on 15 Officer-Like Qualities organised into four factors: planning, social, dynamic, and character. They are not a checklist; the assessors look for the integrated pattern.
- Effective Intelligence
- Reasoning Ability
- Organising Ability
- Power of Expression
- Social Adaptability
- Cooperation
- Sense of Responsibility
- Initiative
- Self Confidence
- Speed of Decision
- Ability to Influence the Group
- Liveliness
- Determination
- Courage
- Stamina
7. The funnel — how the numbers narrow
These are illustrative orders of magnitude from recent UPSC NDA cycles (refer the live notification & result PDFs on upsc.gov.in for the exact figures of your year):
Notified vacancies per NDA exam typically include Army (largest share), Navy, Naval Academy 10+2 Cadet Entry, Air Force (flying / ground duty tech / ground duty non-tech). Exact splits vary cycle by cycle and are published in each UPSC notification.
8. The medical examination — Special Medical Board
After SSB recommendation, candidates report to a designated Military Hospital for the Special Medical Board (SMB). The medical examination is extensive — typically 4–5 days as an inpatient — and covers the full physical workup: height, weight, BMI, vision, audiometry, dental, ENT, cardiovascular, pulmonary, abdominal, musculoskeletal, urology, psychiatry screening, and lab workup including X-ray and ultrasound.
Vision standards are the most service-specific gate. The Air Force flying branch requires the tightest visual acuity, refractive error, and colour vision standards. Army and Navy allow slightly broader refractive limits (verify exact figures in the current AFMSF / DGMS standards).
A candidate found temporarily unfit may seek an Appeal Medical Board (AMB) and, if necessary, a Review Medical Board (RMB). The process is time-bound — typically within 42 days of the SMB result. Permanent unfitness for entry is final unless the underlying condition is correctable within the appeal window.
The medical filters more recommended candidates than people expect. Hidden things — borderline vision, a healed hernia repair, a minor cardiac murmur, undetected colour deficiency — turn up here. If you are serious about NDA, do a full pre-medical workup before the SSB so you know your gaps.
9. Training — three years at NDA, one at the service academy
The NDA course runs three years across six terms. Academic instruction (BSc/BSc CS/BA from Jawaharlal Nehru University) sits alongside drill, physical training, weapons handling, fieldcraft, service-specific orientation, sport, and outdoor camps. The fourth year is at the service academy:
10. Pay during training and on commissioning
Per the 7th Central Pay Commission and subsequent MoD orders, cadets at NDA / IMA / INA / AFA receive a fixed stipend during training. The most-cited published figure is ₹56,100 per month — this is Cell 1 of Pay Level 10 (the Lieutenant starting level). The full Lieutenant pay structure (basic pay + Military Service Pay + Dearness Allowance + allowances) begins from the date of commissioning.
Source: 7th CPC Report, Government of India (2016); MoD pay rules and DA notifications. DA is revised semi-annually; verify current rate. Posting-specific allowances (field, high altitude, counter-insurgency) are additional — see our 7th CPC Officer Pay Calculator.
Want the full pay picture — with field area, high altitude, CILQ, CEA, and net take-home? See the Indian Officer Pay Calculator (7th CPC).
11. Service obligation and the career arc
NDA leads to a Permanent Commission. The minimum qualifying service for a service pension is 20 years from the date of commissioning (officer pension rules — verify the current rule for your service). Officers serving 20+ years are entitled to a service pension equal to 50% of last drawn emoluments (subject to OROP adjustments).
The earliest premature retirement window depends on service-specific rules and on whether the officer has been clear of any bond obligations (NDA grants you a Bachelor's degree, which itself carries no bond, but flying training, specialist post-graduate education, and certain advanced courses do).
For a full career-arc timeline — rank-by-rank time spent, decision points, pension milestones — see our interactive timeline tool.
12. Sources
- Union Public Service Commission — NDA & NA Examination notifications and results (upsc.gov.in)
- National Defence Academy — Course structure and academic streams (nda.nic.in)
- Indian Army recruitment portal (joinindianarmy.nic.in)
- Indian Navy recruitment portal (joinindiannavy.gov.in)
- Indian Air Force career portal (careerindianairforce.cdac.in)
- Ministry of Defence — Pay rules, DA notifications, 7th CPC implementation orders
- Supreme Court of India — Kush Kalra v. Union of India, interim order dated 18 August 2021
- Seventh Central Pay Commission Report (2016), Government of India