NDA

To be eligible to appear in NDA examination, you should have completed 12th standard or an equivalent examination from a recognised board. You must be at least 16.5 years old and not more than 19.5 years of age. You should be an Unmarried Male candidate and should be physically fit. If you can satisfy the above mentioned eligibility criteria then, you are eligible to write NDA examination.

That's great. Make him thorough in Physics, Chemistry and Mathematics.

Yes, you can. There is no problem.

I have earlier answer this type of question. Yes, you can Obtain the equivalency certificate from Technical educational board for this and attach it at the time of applying on line. Good luck. Comdt Saxena. Director Rakshaacademy Ahmedabad.