HELLO RAHUL

NDA is conducted by UPSC(Union Public Service Commission) which has defined an eligibility criteria as the
Candidates who fall between the age group 16.5 years - 19.5 years are only eligible to apply.

Minimum education qualification required to apply for NDA is 10+2 (Army), 10+2 (Physics and Maths for Air Force & Navy)

The first condition is true for your case but you should also fit in the second condition apart from age and educational qualifications there are also several other eligibility criteria such as martial status nationality etc

You will get a detailed explanation about this by using the given link
https://competition.careers360.com/articles/nda-eligibility-criteria

HOPE IT HELPS!!