Hi

To be eligible for NDA examination, you need to pass 12th examination.

Coming to board% criteria/requirement,

There is no minimum percentage barrier in 12th to be eligible for NDA , all you need is to pass 12th.

Now,

You have biology as an additional / 6th subject in 12th , even if you have failed in it  , you are still eligible for NDA, provided you should have overall your passed 12th with 5 subjects i. e your result status should be pass on your 12th marksheet/results   .

For your reference,

NDA eligibility criteria is given below-

-------------) Qualifucation required :-

• For army :- you need educational  qualification of 10 + 2 in any stream .

• For navy and Airforce :- You need qualifucation of 10 + 2 with Physics and Maths .

-------------) You must be  in the age group of 16.5 to 19.5 years old to be eligible.

-------------) Now, girls are also eligible for nda . For details on this refer:- https://news.careers360.com/nda-2021-sc-allows-women-appear-in-national-defence-academy-exam-slams-army-for-gender-discrimination

-------------) Nationality

For details you can visit our page, the link for the same is provided below

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

>>>>> Selection process

The selection process consist of 2 stages :-

******** Qualify the written examination :- it consist of 2 papers :-

• Mathematics

• General Ability Test

You get 2 hours and 30 minutes for each paper.

********SSB interview :- If you clear written examination then you will called for a 5 day SSB interview

If you clear SSB interview then you will have you to go through medicals to check your fitness if you clear the medicals as well then congratulations you are in.

Thank you