Colleges in West Bengal

Amity University, Gwalior is a private university located in Madhya Pradesh. It is accredited Grade A by the NAAC. Amity Gwalior offers B.Tech course in total 9 specializations. The candidates who are willing to apply for this course must have scored at least 60% in Chemistry, Math, Physics, and English combined in 10+2.
The eligible candidates can apply for Amity JEE exam. The selection of the candidate would be done on the basis of the score obtained by the candidate. The will followed by a test on the day of the interview.
Direct admission is also done on the basis of a valid score in JEE Main.

https://www.shiksha.com/b-tech/course/b-tech-in-bio-technology-techno-india-university-salt-lake-city-kolkata-200973
Refer the above mentioned link.

No, you won't get CSE in Heritage. Try for other branches.

My score : 208,AIR-12381,OBC NCL-3404

It changes every year and you have to get a seat for their admission test and there criteria is 70% in maths, chemistry and physics in 10+2 exam.

You need to have 50% and above for admission in this college and course.

You need to have 12th from a recognized board with minimum 50% marks.

In Kolkata the list of top 10 college are:-
Jadavpur University
IEM
Heritage
Techno India Salt Lake
St. Thomas
RCCIT
Techno Rajarhat
BPPIMT.

Don't go for Vidyasagar University. You will never get placement. Try for another one. Another thing is, I was former student of VU MBA, and I didn't give CAT or MAT exam.