CBSE 12th

You will surely get a call. To convert, perform well in PI and written test conducted by the college.
All the best.

TOEFL and SAT are accepted by Harvard University for undergraduate programs. The fee is Rs.50 lakhs per annum.

No, you would not be able to surpass the cutoff (which is minimum of 300 out of 450) if you only prepare for the 12th syllabus. The 11th syllabus is as important as the 12th and carries equal weightage (might vary a little bit). It is advised that you prepare both the 11th as well as 12th syllabus. The questions would be direct and easy. Just try to focus on the important topics. Hope you do well.
Best of luck.

Yes, you have high chances.

You have high chances of being getting selected.

Hello,
Engineering itself is a science of innovation. I would suggest you to explore the particular branch of engineering, which interests you and go for it. This will automatically make sure your marks are a lot better, provided, you study with full dedication.

IITs don't offer B.Sc programmes, they provide B.Tech and M.Tech only.

Firstly, you should apply for JEE mains but it's date is over. So, go for other exams which you like.

You should read your 11th and 12th NCERT textbooks perfectly and then go for HC Sharma for physics.

It is not possible to become the same after 12th. You must pursue Bachelor's degree in automobile engineering or other equivalent course.