B.Tech

You can't apply for any other institute between your 4 years B.Tech regular course. However, you can take transfer to another campus branch of same university or college.

Amity University Mumbai take admission based on your 12th marks. For B.Tech in Biotechnology minimum 55% in PCM is required. As you secured 91.66% in boards than you can take direct admission without any test or interview and as your percentage is more than 88% you'll have to pay just 50% of the tuition fees.

For Anna University admission candidates must have studied mathematics, physics and chemistry. The candidate should have passed in all the subjects and scored a minimum average of 50% in mathematics, physics and chemistry put together.

You are eligible as per AKTU Norms.
Candidate must have passed qualifying exam with minimum 50% marks (45% marks for SC/ST Category) in aggregate in three subjects. Also, qualifying exam should be passed without grace.

Go through the link below for detailed UPSEE syllabus :
https://www.shiksha.com/b-tech/upsee-exam-syllabus.

It is around Rs. 30-60 lacs a year. Private universities are expensive than public universities. Check study abroad. Shiksha.Com.