In short: NDA (National Defence Academy) exam is conducted by UPSC twice a year for admission to the Army, Navy, and Air Force wings. Eligibility: age 16.5-19.5 years, Class 12 pass or appearing (girls now eligible after the Supreme Court verdict). The written exam has Maths (300 marks) and GAT (600 marks) for a total of 900 marks, followed by an SSB interview (900 marks). Preparation overlaps with Class 11-12 NCERT Maths, English grammar, and General Knowledge.
What Is the NDA Exam?
The National Defence Academy (NDA) exam is India's premier entrance test for students who want to join the Armed Forces — Indian Army, Indian Navy, or Indian Air Force — as commissioned officers. Conducted by the Union Public Service Commission (UPSC), it is held twice a year (NDA I in April and NDA II in September).
After clearing the written exam, candidates undergo a 5-day SSB (Services Selection Board) interview that tests personality, leadership, and officer-like qualities. Selected candidates train at the National Defence Academy in Khadakwasla, Pune, for 3 years, followed by specialized training at their respective service academies.
Key facts about NDA 2027:
| Parameter | Details |
|---|---|
| Conducting body | UPSC (Union Public Service Commission) |
| Frequency | Twice a year (NDA I and NDA II) |
| Written exam marks | 900 (Maths 300 + GAT 600) |
| SSB interview marks | 900 |
| Total marks | 1800 |
| Duration | Maths: 2.5 hours, GAT: 2.5 hours |
| Mode | Pen and paper (OMR-based) |
| Wings | Army, Navy, Air Force |
| Training location | NDA Khadakwasla, Pune |
| Training duration | 3 years (NDA) + 1 year (service academy) |
Eligibility Criteria for NDA 2027
Age Requirement
| NDA Session | Age Range | Birth Date Range (Example) |
|---|---|---|
| NDA I 2027 (April exam) | 16.5 to 19.5 years | Born between July 2, 2007 and July 1, 2010 |
| NDA II 2027 (Sept exam) | 16.5 to 19.5 years | Born between January 2, 2008 and January 1, 2011 |
Educational Qualification
| Wing | Minimum Qualification |
|---|---|
| Army Wing | Class 12 pass or appearing (any stream) |
| Navy Wing | Class 12 pass or appearing with Physics and Maths |
| Air Force Wing | Class 12 pass or appearing with Physics and Maths |
Important: For Navy and Air Force, you must have Physics and Mathematics in Class 12. Arts and Commerce students can only apply for the Army wing.
Gender Eligibility
Girls are now eligible for NDA following the landmark Supreme Court verdict in 2021. Female candidates can apply for all three wings (Army, Navy, Air Force) with the same eligibility criteria as male candidates.
Physical Standards
| Parameter | Army | Navy | Air Force |
|---|---|---|---|
| Minimum height (male) | 157 cm | 157 cm | 162.5 cm |
| Minimum height (female) | 152 cm | 152 cm | 152 cm |
| Vision (uncorrected) | 6/6 in one eye, 6/9 in other | 6/6 in both eyes | 6/6 in one eye, 6/9 in other |
| Correctable vision | Allowed with limits | Stricter | Strictest (must be near-perfect) |
| Color blindness | Not acceptable | Not acceptable | Not acceptable |
| Chest expansion | Minimum 5 cm | Minimum 5 cm | Minimum 5 cm |
| Weight | Proportional to height and age | Proportional | Proportional |
Air Force has the strictest physical requirements, especially for vision. If you wear glasses, check the latest UPSC notification for the exact permissible limits.
NDA Written Exam Syllabus
Paper 1: Mathematics (300 Marks)
The Maths paper is at Class 11-12 level. It covers:
| Topic | Subtopics | Approximate Questions |
|---|---|---|
| Algebra | Sets, Relations, Complex Numbers, Quadratic Equations, Permutations, Combinations, Binomial Theorem, Logarithms | 25-30 |
| Matrices and Determinants | Types of matrices, operations, determinant properties, Cramer's rule | 8-10 |
| Trigonometry | Trigonometric ratios, identities, equations, inverse trigonometric functions, properties of triangles | 15-20 |
| Analytical Geometry (2D) | Straight lines, circles, parabola, ellipse, hyperbola | 15-20 |
| Analytical Geometry (3D) | Distance formula, direction cosines, equations of lines and planes | 5-8 |
| Differential Calculus | Limits, continuity, differentiation, application of derivatives, maxima/minima | 15-20 |
| Integral Calculus | Integration, definite integrals, area under curves, differential equations | 15-20 |
| Vector Algebra | Addition, dot product, cross product, scalar triple product | 5-8 |
| Statistics and Probability | Mean, median, mode, variance, probability (basic and conditional) | 8-10 |
Total: 120 questions, 300 marks, 2.5 hours
Marking: +2.5 for correct, -0.83 for incorrect (1/3 penalty)
Paper 2: General Ability Test (GAT) — 600 Marks
The GAT paper has two parts:
Part A: English (200 Marks)
| Topic | What It Tests | Questions |
|---|---|---|
| Grammar | Articles, prepositions, tenses, voice, narration, subject-verb agreement | 20-25 |
| Vocabulary | Synonyms, antonyms, one-word substitution, idioms and phrases | 15-20 |
| Comprehension | Passage reading + questions | 10-15 |
| Sentence improvement | Spotting errors, sentence correction | 10-15 |
| Fill in the blanks | Contextual word usage | 10-15 |
| Rearrangement | Sentence rearrangement, paragraph ordering | 5-10 |
Part B: General Knowledge (400 Marks)
| Topic | Subtopics | Questions |
|---|---|---|
| Physics | Class 11-12 level (mechanics, heat, optics, sound, electricity) | 15-20 |
| Chemistry | Class 11-12 level (elements, reactions, everyday chemistry) | 10-15 |
| Biology | General biology (human body, diseases, nutrition, botany basics) | 10-12 |
| History | Indian history (ancient, medieval, modern, freedom struggle) | 15-20 |
| Geography | Indian and world geography (physical, climate, resources, maps) | 15-20 |
| Current Affairs | National and international events (last 6-12 months) | 15-20 |
| Indian Polity | Constitution, fundamental rights, Parliament, judiciary | 10-12 |
| Economics | Basic economic concepts, Indian economy, budget, GDP | 5-8 |
| Defence and Security | Defence news, exercises, weapons, recent operations | 5-8 |
| General Science | Scientific discoveries, space missions, technology | 5-8 |
Total GAT: 150 questions, 600 marks, 2.5 hours
Marking: +4 for correct, -1.33 for incorrect (1/3 penalty)
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NDA vs CDS — Quick Comparison
| Feature | NDA | CDS |
|---|---|---|
| Age limit | 16.5-19.5 years | 20-25 years (varies by academy) |
| Education | Class 12 pass/appearing | Graduate (degree holder) |
| Who it is for | After Class 12 | After college graduation |
| Training duration | 3 years NDA + 1 year academy | 18 months (IMA/OTA) |
| Written exam subjects | Maths + GAT | English + GK + Maths (for IMA/NA) |
| Training academy | NDA Khadakwasla → respective academy | IMA Dehradun / OTA Chennai / AFA Hyderabad / NA Ezhimala |
| Career advantage | Earlier start (join at 19, commission at 22-23) | Start later (join at 22-25) |
| Prestige | NDA has a strong brotherhood culture | CDS is respected equally |
Key difference: NDA is for students right after Class 12 who want the youngest possible start in the Armed Forces. CDS is for graduates. If you are in Class 11-12 and interested in defence, NDA is your path.
Monthly Preparation Plan for NDA 2027
Phase 1: Foundation (Months 1-4)
| Month | Focus Area | Daily Hours |
|---|---|---|
| Month 1 | Class 11 Maths revision (Algebra, Trigonometry basics) + English grammar basics | 3-4 |
| Month 2 | Class 11-12 Maths (Calculus basics, Coordinate Geometry) + Vocabulary building | 3-4 |
| Month 3 | Class 12 Maths (Integration, Probability) + History (Ancient + Medieval India) | 4-5 |
| Month 4 | Complete Maths syllabus + Geography (Physical India) | 4-5 |
Phase 2: Building (Months 5-8)
| Month | Focus Area | Daily Hours |
|---|---|---|
| Month 5 | Maths practice (previous papers) + Modern History + Polity | 5-6 |
| Month 6 | GK intensive (Physics, Chemistry, Biology basics) + English comprehension | 5-6 |
| Month 7 | Current affairs catchup (6 months) + Defence knowledge + Mock tests begin | 5-6 |
| Month 8 | Full-length mock tests (2 per week) + Weakness analysis + Current affairs | 5-6 |
Phase 3: Final Sprint (Months 9-10)
| Month | Focus Area | Daily Hours |
|---|---|---|
| Month 9 | Mock tests every 3 days + Maths speed practice + GK revision | 6-7 |
| Month 10 | Daily mock tests + Formula revision + Current affairs update + Light revision | 5-6 |
SSB Interview — What Comes After the Written Exam
Clearing the NDA written exam is only half the battle. The SSB interview is equally weighted (900 marks) and tests your personality, leadership potential, and officer-like qualities.
SSB Interview Structure (5 Days)
| Day | Activity | What Is Tested |
|---|---|---|
| Day 1 | Screening Test (OIR + PP&DT) | Intelligence, perception, personality |
| Day 2 | Psychology Tests (TAT, WAT, SRT, SD) | Thought process, personality traits |
| Day 3 | Group Testing (GD, GPE, PGT, HGT, GOR) | Teamwork, leadership, communication |
| Day 4 | Group Testing (continued) + Lecturette + Individual Obstacles | Physical courage, command |
| Day 5 | Personal Interview + Conference | Final assessment, overall evaluation |
Officer-Like Qualities (OLQs) Tested
The SSB assesses 15 Officer-Like Qualities grouped into 4 factors:
- Planning and Organizing: Effective intelligence, reasoning ability, organizing ability, power of expression
- Social Adjustment: Social adaptability, cooperation, sense of responsibility
- Social Effectiveness: Initiative, self-confidence, speed of decision, ability to influence others, liveliness
- Dynamic: Determination, courage, dedication, stamina
How to Prepare for SSB
- Read newspapers daily: The Hindu or Indian Express for current affairs and editorial analysis
- Practice group discussions: Join a study group and discuss current topics weekly
- Develop hobbies and extracurriculars: SSB values well-rounded candidates
- Physical fitness: Start a daily exercise routine — running, push-ups, pull-ups, and obstacle course training
- Read about defence forces: Know the Chief of Army/Navy/Air Force, recent defence exercises, weapons systems, and India's defence policy
- Communication skills: Practice speaking clearly and confidently in English
Physical Fitness Preparation
NDA requires a high level of physical fitness. Start preparing alongside academics:
| Activity | Target | Frequency |
|---|---|---|
| Running (1.6 km) | Under 6 minutes | Daily |
| Push-ups | 30+ in one set | Daily |
| Pull-ups | 8+ | Daily |
| Sit-ups | 50+ in one set | Daily |
| Squats | 40+ | 3 times/week |
| Swimming | Basic proficiency | Learn if you cannot swim |
| Sports | Any team sport (football, basketball, cricket) | 3-4 times/week |
Important: Physical fitness is not just for the SSB. NDA training at Khadakwasla is physically demanding. Students who join without fitness preparation struggle significantly in the first term.
Books and Resources for NDA
| Subject | Recommended Resources |
|---|---|
| Mathematics | NCERT Class 11-12 + RS Aggarwal (Quantitative Aptitude) + Pathfinder NDA (Arihant) |
| English | Wren and Martin (grammar) + Word Power Made Easy (vocabulary) + newspapers |
| Physics/Chemistry/Biology | NCERT Class 11-12 (basic understanding sufficient) |
| History | NCERT Class 6-12 History + Spectrum Modern India |
| Geography | NCERT Class 6-12 Geography + Oxford Atlas |
| Polity | NCERT + Indian Polity by Laxmikanth (selected chapters) |
| Current Affairs | Monthly magazines (Pratiyogita Darpan / Competition Success Review) + daily newspaper |
| Previous papers | Arihant NDA/NA Previous Year Papers (solve last 10 years) |
| Mock tests | Arihant, Disha, or free online NDA mock tests |
Frequently Asked Questions
Can girls apply for NDA 2027?
Yes. Following the Supreme Court verdict in 2021, female candidates can apply for NDA across all three wings — Army, Navy, and Air Force. The eligibility criteria and selection process are the same.
I am from Arts stream — can I apply for NDA?
Yes, but only for the Army wing. Navy and Air Force wings require Physics and Mathematics in Class 12. Arts students should focus on the Army wing and prepare Maths from scratch using NCERT Class 11-12 books.
What is the NDA salary after training?
NDA cadets receive a stipend of ₹56,100/month during training. After commissioning as a Lieutenant, the starting salary is approximately ₹80,000-90,000/month plus allowances (DA, MSP, kit maintenance) bringing the in-hand salary to ₹1-1.2 lakh/month.
How many attempts are allowed for NDA?
You can attempt NDA as many times as you want within the age limit (16.5-19.5 years). Most students get 3-4 attempts. Each NDA I and NDA II counts as separate attempts.
Is coaching necessary for NDA?
No. NDA can be cracked through self-study. The Maths syllabus is Class 11-12 level, English is testable through grammar books and newspaper reading, and GK requires consistent current affairs reading. Many successful NDA candidates prepared without coaching.
What if I clear the written exam but fail the SSB?
You get another chance. If you clear the written exam, you are called for SSB. If you fail SSB, you can attempt the next NDA exam (written + SSB again). SSB preparation improves significantly with each attempt because you understand the process better.
Can I prepare for NDA and JEE/NEET simultaneously?
JEE Maths preparation overlaps significantly with NDA Maths. If you are preparing for JEE, NDA Maths will be easy. You need to additionally prepare English and GK for NDA. NEET preparation has less overlap (Biology instead of Maths), so NEET + NDA is harder to combine.
What is the physical fitness test at SSB?
The physical tests include running, obstacle course, and group physical activities. There is no formal fitness test with fixed pass marks, but candidates who are visibly unfit or cannot complete basic physical tasks are evaluated negatively.
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