CBSE 12th

You need to be good in mathematics because after B.Sc + M.Sc, you can do PhD and can become a great mathematician. You can go for statistics also.

To get qualified in any college you need at least is a competitive exam result. But, many colleges are there where you can try because they have their own internal examination.

Hi,
Yes, you can join the course after your HSC, in fact it is the correct time for you think about your career. There many options available to choose form in animation, VFX Media and gaming. Talk to an experienced career advisor and get right information.

Kindly refer to the link below:
https://www.shiksha.com/career-opportunities

You may opt for Banaras Hindu University.

You should go for commerce and choosing mathematics is up to you.

Hi,
You can go for CEH or CISSP.

You should pursue MBA. Try to score more than 97 percentile in management entrance exam. MS is also a good option if you score more than 32 marks in GRE exam. If you want to stick to the technical field, then opt for M.Tech, but competition is very tough for that as there are very few ace colleges for pursuing M.Tech.

Hi Oshi,
Kindly specify your subjects.