Dear Student,

Any student who have passed his 12th exam from a recognized board with any stream can give the NDA entrance exam, and the age limit is between 16.5 - 19.5 years.

There is not a mandatory thing that only Sainik school students are allowed to give the entrance exam, if you are enrolled in any school and had completed your 12th then you are also eligible to give the entrance exam.

After every six month NDA post the notification with the vacancy around 400 - 450, and it vary according to the availability of seat.

Good luck :)