Defence exams in India are conducted by UPSC, the Armed Forces and the Ministry of Defence. From NDA for Class 12 students to CDS for graduates to Agniveer for school-leavers — each entry route has a distinct structure, age window and physical standard. This page maps all of them.
Defence career routes split into two tracks: Officer Entry (NDA, CDS, AFCAT — requires SSB) and Soldier/Sailor Entry (Agniveer — requires physical and medical clearance). Choose your track based on eligibility and ambition.
NDA, CDS, AFCAT and Territorial Army officer entries all follow the same fundamental architecture. Understanding all three stages before you start preparing changes how you prepare from Day 1.
Tests academic readiness. NDA: Maths + General Ability Test. CDS: English + GK + Elementary Maths. AFCAT: Verbal + Numerical + Reasoning + GK. Written exam results in an SSB call-up letter — not final selection.
5-day assessment at a Services Selection Board. Tests Officer Like Qualities (OLQs) through psychological tests, Group Testing Officer tasks and a Personal Interview. No coaching can fake personality consistently across 5 days.
Strict physical and medical standards. Eyesight, bone structure, body mass, hearing and overall fitness are tested. Recommended candidates at SSB can be rejected at medical. Standards vary by branch — flying branch has the strictest requirements.
Most defence aspirants study the written exam seriously and the SSB casually. That is the single biggest preparation mistake. The SSB is not an interview — it is a 5-day observation process where every interaction is assessed.
The board observes 15 Officer Like Qualities (OLQs) across all 5 days simultaneously. You cannot switch on "SSB mode" — the board looks for consistency between your psychology tests, group behaviour and personal interview.
Across NDA, CDS and AFCAT, the subject overlap is significant. Build common strengths first, then specialise by exam.
| Mathematics (Class 11–12) | Critical | |
| English (Grammar + Comprehension) | Very High | |
| General Knowledge (History, Polity) | High | |
| Physics & Chemistry | High | |
| Geography & Current Affairs | Medium |
| English (Comprehension + Grammar) | Very High | |
| General Knowledge (Defence focus) | Very High | |
| Elementary Maths (CDS) | High | |
| Reasoning & Numerical (AFCAT) | High | |
| Current Affairs + Science | Medium |
Choose the plan based on your current stage and target exam. Physical training is not optional — begin it from Week 1, not after clearing the written exam.
NDA Maths is the single biggest differentiator. It is also the hardest section to improve quickly — so it must be addressed first.
Complete the Maths syllabus (Class 12 topics) and systematically build the General Ability Test. GAT has 6 sections — History, Geography, Polity, Economy, Physics, Chemistry. Build each section in blocks.
Full NDA mock tests every 5–6 days. Simultaneously begin SSB preparation — this is not something you can rush in 2 weeks after results.
Between written result and SSB call, typically 2–3 months. This is the most important personality development window.
CDS written is generally considered moderate difficulty. The challenge is GK depth — especially defence-specific and geopolitical content that standard UPSC GK prep doesn't cover.
If targeting both CDS and AFCAT, prepare them together — the syllabus overlap is approximately 70%. AFCAT adds Numerical Ability and Reasoning (no separate Maths paper like CDS).
Final 6 weeks before written exam: full mocks, short revision cycles, current affairs update. Simultaneously prepare SSB foundation.
Agniveer written exams test Class 10–12 level content depending on the category. The physical fitness test (PFT) is run simultaneously in importance.
Agniveer written exams are time-compressed. Practice speed. Physical standards are non-negotiable — no medical exemption, no second chances at PFT.
Most failures happen at the SSB stage — not the written exam. These are the patterns the board sees every cycle.
Aspirants who start running 3 weeks before SSB consistently fail the PFT or struggle visibly during GTO tasks. Physical fitness builds over months — not weeks. Start training from the first week of preparation, not after results.
Many aspirants focus on GAT and score well on the 600-mark paper but score poorly on Maths (300 marks). Since both have separate qualifying marks, a poor Maths score eliminates even high GAT performers.
Candidates who memorise "recommended" stories for TAT/WAT and regurgitate coached responses are typically identified on Day 3–4 when their group behaviour contradicts their psychological tests. The board has seen every pattern.
Flying branch requires 6/6 uncorrected vision in both eyes. Candidates discover this at the medical stage — after clearing written and SSB. Check the complete medical standards for your chosen branch before applying.
NDA and CDS are conducted twice a year each. AFCAT is also twice yearly. A serious aspirant should be appearing in every available cycle — each attempt builds SSB experience, which directly improves the next recommendation rate.
NDA age limit is strict: 16.5 to 19.5 years with zero relaxation. CDS has different age limits per academy. Missing an application because of calendar confusion costs an entire attempt that can never be recovered.
The Personal Information Questionnaire (PIQ) filled at SSB becomes the IO's interview guide. Vague or inconsistent entries create interview traps. Fill it with specific, honest, memorable details — not generic statements.
The most common GTO mistake: candidates who dominate group discussions rather than facilitating them. Leadership in SSB means integrating quiet members, building group consensus and completing the task — not being the loudest voice.
Defence preparation is unique because the physical, academic and personality components must all be developed simultaneously. You cannot ace the written exam and then start running. The SSB observes who you are — not who you've memorised being. Start early. Train consistently. Apply to every cycle within your age window.