CBSE 12th

Yes you can take coaching.Your class 12 percentage shows you can get much better score than this in JEE-mains.

now you are waiting for All India Rank declared by CBSE and you are eligible for NITs and IIITs.

MBBS, BDS for PCB students and B.tech ,BCA for PCM students for those who want to studies professional and applied however if you want to do research in basic science you can go

You will get a seat or not it depends totally on which category are you from and from which board have you completed your 12th standard.

if you want to take admission in bsc Biotechnology in jaipur only I would like to suggest you dr blal Institute of Biotechnology as it is the best in jaipur ,you can go for Biotechnology if you are from maths or biology background. but sorry 30000 will not be enough, 55000 per year is the fees of Institute.

Well it will be difficult getting in this college. Based on your marks, your JEE rank would be 300000-400000. This is very far behind even though you have the SC quota. NITH will be difficult to get into, in any branch.

Yes. definitely. Dor bsc the eligibility is just u have to pass out or clear 12th science

First of all.learn all the basic formulas of integration.
Then do examples before each exercise.and see whats the basic tricks are used in these examples.
After doing few examples u should get the idea.then start exercise.questions.
And don't skip miscellaneous exercise and examples.
This would b enough for 12th level.
And also take help of ur teachers.