NDA

You can choose Science stream with Physics, Chemistry, Maths as your main subjects. Also, you can opt physical education for increase more knowledge related to this exam to learn more about physical and mental fitness. Best of luck.

You should read Hindu or Indian Express newspaper on daily routine. Increase your general awareness and basic knowledge to crack NDA, and to secure a good rank. Best of luck.

Yes, you can apply, but you are only eligible for army only. But, don't worry work hard and will make it.

Technical entry of 10+2 offer by army and navy only, this is done on the basis of your class 12th PCM marks, while air force does not offers such entry.

UPSE conduct NDA exam twice a year, and you need to clear that, you can apply from 16.5 to 19.5.

Hello,Preparing for NDA is not just all about to prepare for written exam, you also need to prepare yourself physically and try to work on your personal development, try to build up some officers like qualities in you, first prepare yourself for written examination.
Go with the syllabus work hard, then make yourself ready for SSB interview.
Don't worry, if you put your hard efforts definitely you will find yourself in NDA one day
All the best.

No I don't think so
You need to have a good eye sight to get admission in NDA.

Here you get complete information about NDA exam eligibility and every bit of information about NDA exam
https://www.shiksha.com/exams/nda
Hope it guides you well.

Yes, you can appear for NDA examination, bit you are not able to become a technical officer.

It depends that how you perform in written exam and the most important in SSB interview. You need to keep in mind, they are not looking for any scholar, but they are looking for a leader. So, by qualifying JEE, no one can assure you that you would be able to clear SSB Interview. Let me tell you one thing. In a batch of 200 candidates in SSB interview, only about to 2 to 3 candidates were able to make for NDA. Don't worry word hard.
You will make it.