Exam

Yes, maths is necessary in 12th standard for IIT. As you are interested in Biotechnology, please search for institutions, which don't require maths as a subject.

Hello, I think you may get admission but first check through Shiksha JEE College predictor tool. Link: https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

You might get NIT - Srinagar, Patna but you should focus on advance.

Yes, all the state governed institute universities exam are left.

If you are interested in science and maths then prefer to take admission for 11th science.

The official answer will be soon going to upload by the CBSE. Then only you will clear your doubt regarding your query. But however you can check it on NET of different coaching institute provided their own answer key
But, I suggest you to go according to the official key only. The answer key will r

Every year, the cutoff varies slightly. So, I advise you to score as much as you can. Because, the more score you get means that higher marks from the cutoff the level for a government college through UPSEE increases. Go with the concepts and prefer NCERT, practice some previous papers also. If you

If you are talking about the GATE exam. Then, you must follow the syllabus of B.Tech only. Then also, you must have some command in English language. Look for study material like made easy publication book for GATE and mock test series on GATE forum also. Go with every subject you can cover most. If

Sorry, as you said you are out of date now you can't apply for CET.