Exam

The modules of NSE depends on kind of your current job. Can you specify your current job to get better answers? However, for a CA aspiring student, NSE modules are not required to enhance job prospects in the financial markets.
All the best.

You should prepare well and give your best. You will be able to crack it.

You can go for CAT exam.

After completing your class 11th, you can register for TOEFL.

First, you have to register and take admission tests like SAT, ACT TOEFL or IELTS and you have to do really well in these tests, if you are particularly aiming for IVY Leagues.
You have to check the university's website, if they require SAT subject test. You can collect your class 9th, 10th, 11th an

Yes, it's possible. However, you will mostly get few IIMs like IIM - Jammu, Nagpur, Amritsar, etc. and if you get above 95 percentile, then you can expect a call from better IIMs like Kashipur, Ranchi, etc.
Good luck.

CMAT is better as there are decent colleges, which accept it like SIMSREE, GIM, etc. CMAT is also comparatively easier than other exams like CAT, XAT, etc.

You can evaluate doing B.Tech in aeronautical engineering from Manipal University or Amity University. These universities have their own engineering entrance examination for admission in engineering degree courses.

You need to score 50% in your UG from B.Tech/BE, or any other Bachelor’s degree like B.Com, BBA and many more. You can also appear for the same, while in your final semester.
Good luck.

You can follow the books of Arihant Publications.