Examination of the NDA (National Defence Academy) & ND (National Defence) is conducted by Union Public Service Commission (UPSC) twice in a year

As you asking here I am telling Terms And Conditions/eligibility criteria to write National Defence Academy exam

Educational:
For Army wing of National Defence Academy:
12th Class pass of the 10+2 pattern of School Education or equivalent examination conducted by a State Education Board or a University.

For Air Force and Naval Wings of National Defence Academy and for the 10+2 Cadet Entry Scheme at the Indian Naval Academy: 1

2th Class pass of the 10+2 pattern of School Education or equivalent with Physics and Mathematics conducted by a State Education Board or a University.

Applicants who are appearing in the 12th Class under 10+2 Pattern of School Education or equivalent examination can also apply for this examination.

Physical Standards:
Applicants must be physically fit according to physical standards for admission to National Defence Academy and Naval Academy Examination (II),

Age:
Only Unmarried Male Applicants born not earlier than 2nd January, 1998 and not later than 1st January, 2001 are eligible.

Sex:
Only unmarried male Applicants are eligible.