Hi Karan,
NDA exam is conducted twice a year by UPSC to recruit candidates for army,navy and air-force wings of naval academy and defence academy.
To appear for this exam candidates needs to fulfil the following eligibility criterias:-
#Age limit:- 17 to 19.5 years
#Marital status:- Unmarried males only
#educational qualifications:-
1.For army wing:- needs to submit 10+2 passing certificate from recognised board
2.For navy/airforce/10+2 schemes:- 10+2 with maths and physics as compulsory subjects.
#physical:-
Height- 152-183 cm.
Weight- 42.5 to 66.5 kg.
Other health checkups reports and etc.; ( this varies for all the three posts).
So, of you are under all these eligibility criteria then you can apply for nda exams easily.
Also, as you are in 12th standard so it is necessary to submit a proof about this and a esurance that you are going to pass your 10+2 exams before final ssb rounds.
For more details and informations you can check out the official sites too.
Good luck .
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