Colleges in West Bengal

I think you will not get Heritage and IEM with this rank. Techno you will get some of the branches. Try for other colleges I am attaching the link where you can check all the details:
https://wbjeeb.nic.in/wbjeebcouns/orcr/PrevYearORCR.aspx.

Yes, placements are there after BBA but to get good salary packages go for MBA after BBA.

Refer the following link:
https://www.shiksha.com/b-tech/resources/wbjee-college-predictor

You might have a chance if you have any reservation criteria else give it a try. You have very great chance to get into this institute with this rank. Attend the counselling and choose your options appropriately. Try Shiksha college predictor for better analysis.

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 Eng

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.