Hello,
In order to give NDA exam there are following eligiblity criteria you must follow
The minimum age limit is 16.5 and maximum age limit is 19.5.
You need to pass your 12 class with mathematics and physics as your subject.
And with this there are some physical requirements you need to follow for that check the below link to see the complete eligiblity criteria.
https://competition.careers360.com/articles/nda-eligibility-criteria
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