NDA

Yes, you can join S V Defence Academy for degree courses. You can choose any of the following courses:
Degree (NDA | AFCAT | TES)
Degree (AIR FORCE | ARMY | NAVY)
Integrated Courses (GROUP IV | SSC | RRB | SI | CONSTABLE)
Job Courses (ARMY | BSF | CRPF | TBP | AR)

No official date has been released by the UPSC but hope so it will be happening in the month of June. And it's also pretty not sure as everything depends on the conditions. If the conditions becomes even worse then I think NDA 1 can be cancelled this year and NDA 2 will only take place. Hope for the betterment so that all exam get postponed should be rescheduled and student's don't face any future career problems.

It depends on what you want to pursue. For NDA, your marks don't matter much. In NDA, they can choose a person with 65% marks and can also deny a person with 95% marks. They need personality, attitude and working abilities which will suit defence forces. While talking about IIT's they are the best colleges not only in INDIA but among the top 100 of the world {some, not all}. Getting into IITs is not easy but if you get into them the lifestyle, character, image, etc. will change and I am pretty sure that a person in an IIT is also among the respected one in the society.

Yes, you have to apply for the navy exam and the application forms are issued annually by the naval department for entrance and if you have once cleared the exam then you will be called for physical and medical and then you are shortlisted to get a joining letter from Navy.

If you are asking about the NDA exam then refer this. The eligibility criteria of NDA is given below. Age limit: Maximum 19 years
Educational qualification :
1. For Air force and Navy wings: Those seeking for Indian Navy and Air Force must have passed their 12th/appearing (10+2 pattern) from a recognised board or University with Physics and Mathematics as a compulsory subject.
2. For Army : The candidates want to apply for Indian Army must have completed 12th (10+2 pattern) or its equivalent exam from a well-recognised board. The appearing candidates can also apply. So from above you can apply for Army wing.

Visit the link to know more about the exam
https://www.shiksha.com/exams/nda-exam.

If his age is in between16.5-19.5 he is eligible to give the exam
kindly visit the link to know more about the exam
https://www.shiksha.com/exams/nda-exam.

Yes, NDA is held twice in a year you can apply for next examination
for more information kindly visit the link given below
https://www.shiksha.com/exams/nda-exam.

Kindly visit the link given below to know more about the exam
https://www.shiksha.com/exams/nda-exam.