Hello,

The age limit to appear for NDA is 16.5 years to 19.5 years. The candidate must have passed 10+2 with Mathematics and Physics to join in Indian Naval Academy or Indian Naval Academy and to join in Indian Military Academy a candidate must have passed 10+2 in any stream from a recognized board. The candidates who are appearing in the qualifying exam that is 10+2 are also eligible to apply. You haven't mentioned in which you are studying so it is not possible to tell you the number of attempts you have left but the last attempt that you can appear is for NDA 2, 2023 provided you must fulfill the education requirements.