Hello aspirant,

Candidates must have completed 12 th standard or equivalent exam from a recognised Board for Indian Army and Physics and Mathematics is compulsory subjects for Indian Air Force and Naval. But you'll be eligible for only Indian Army.

For NDA 2 - 2022, candidates must have born not earlier than January 2, 2004, and not later than January 1, 2007.

For NDA 1, candidates should be born not earlier than July 2, 2003 and not later than July 1, 2006.

For more information go through below mentioned link.

https://competition.careers360.com/articles/nda-eligibility-criteria

Hope this information was helpful to you.

Best of Luck!!