IIT

May be not for more details Kindly visit this link:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor. Better luck.

IitB IITM IITKGP IITK NITT NITW NITS are best.

75 % is for CBSE students only, for other boards it may be less or more.

Yes, you can do it is possible.

The package can range around 12-20 Lacs pa. The website of iit you are in/aiming for contains all the official and exact placement records.

It has great scope if done through IIT. Career Opportunities in Biotechnology graduates have a vast field of career opportunities depending on their chosen field. India is soon to be a hotspot for Biotech Industry. It is estimated that Biotech sector in India is estimated to grow by30.46 percent CAGR by2025and, India is among the top 12 biotech destinations in the world and ranks third in the Asia-Pacific region. Biotechnology is a promising field that can bring about appreciable changes in agriculture trends, food productions and, healthcare.

Environmental engineering is a better option, as the scope for this field is increasing rapidly day by day.

I don't think you can get good after passing out from IIT. You can expect a starting salary of maximum INR. 15 Lacs in top IITS in civil. So, most of them go for higher studies or either go for exams like GATE UPSC IES etc.

IIT Delhi
IIT Kharaghpur
IIT Roorkee
IIT Guwahati
All the best.

Yes, it is possible, but you will not get stipend of 1 year which you got in private college.