The National Defence Academy (NDA) is the main route for entering the Army, Navy and Air Force as an officer straight after Class 12. UPSC holds the written examination twice a year, and the Services Selection Board (SSB) does the selection that follows. For a student choosing a stream at 15, the practical question is simple: which Class 11 and 12 subjects keep this door open?
We checked the answer against the official UPSC notice for the NDA and Naval Academy examination, 2026. Rules and dates are reissued with every notice, so use this as a guide to the shape of the route and check the current notice before you plan around it.
The subject rule, wing by wing
| Entry | What the notice asks for |
|---|---|
| NDA Army wing | A pass in Class 12 under the 10+2 pattern, with no particular subjects named |
| NDA Air Force and Naval wings | A pass in Class 12 with Physics, Chemistry and Mathematics |
| Indian Naval Academy, 10+2 Cadet Entry Scheme | A pass in Class 12 with Physics, Chemistry and Mathematics |
So the stream you need depends on the wing you hope for. Students who are certain they want the Army can come from Commerce or Humanities. Students who want the Navy or the Air Force need Science with Maths. If you are not sure, Science with Maths keeps all three open.
Who can apply
- The notice allows unmarried male and female candidates. Vacancies are set separately for each, and selection is done separately.
- There is an age window of roughly three years, set in each notice by birth date. For the 2026 second examination it ran from 1 January 2008 to 1 January 2011. A student planning ahead should count from their Class 10 certificate and check the dates in the notice for the cycle they would sit.
- Candidates must meet the nationality conditions in the notice and must be unmarried until training ends.
The exam that applies to every stream
Whichever wing you aim for, the written paper is the same. It has two objective papers of two and a half hours each:
- Mathematics, 300 marks.
- General Ability Test, 600 marks, covering English and General Knowledge including Physics, Chemistry, General Science, History, Geography and Current Events.
Calculators are not allowed. Those who qualify go on to the SSB interview, which tests personality and officer-like qualities, and a medical examination. The Commission sets the qualifying marks.
This is the part many Commerce and Humanities students overlook. The Army wing does not name Maths as a Class 12 subject, but the written examination still includes a 300-mark Maths paper. A student from another stream has to be prepared to cover that syllabus alongside the school course, which is a real workload.
What this means for your choice at 15
| Your situation | What to do |
|---|---|
| Certain about defence and unsure of the wing | Choose Science with Physics, Chemistry and Maths to keep all three wings open |
| Certain you want only the Army, and Science is a poor fit | Other streams are allowed, but plan for the Maths paper and the General Ability Test from Class 11 |
| Interested but not certain | Pick the stream that suits you, and treat the NDA as one of several routes, since defence has other entry points |
There are other routes into the forces later, including after graduation, so the NDA is not the only door. If you are not sure the NDA is right for you, here is how to keep your options wide when choosing a stream.
Questions worth asking yourself first
- Do I want to be an officer in the forces, or do I like the idea of it? The training and life are demanding, and the SSB looks for the former.
- Am I willing to work on Maths and general knowledge for years, whichever stream I choose?
- Am I physically fit and comfortable with discipline and living away from home at a young age?
- If I do not clear it, what is my second route? Many students attempt more than once, and some take another path.
A related route: the Army’s 10+2 Technical Entry Scheme
There is a second way for Science students to become Army officers after Class 12, with different rules, including a minimum in your Class 12 science marks. We explain it here.
Where an assessment helps
An assessment cannot tell you whether you will pass the SSB, since that depends on qualities no school test measures. It can show whether your numerical and reasoning profile fits a Maths-heavy route, and whether your interests point toward Science, where all three wings stay open. Here is how we measure it, and the report ranks the three streams against your results.
