WBJEE

From the analysis of previous counselling process, if you wait till the 3rd round, you might get civil in Heritage with this rank.
You will get Applied Electronics in Heritage College with this rank.
In IEM, there is no scope for any branches.

No, you will not get Heritage, try for other colleges.

No, this rank is not suitable for taking admission in Heritage.

In Heritage, you will not get any branches with this rank.

No, you will not get mechanical. I think you will not get any branches in Heritage with this rank.

You cannot get admission in Heritage, IEM,Haldia but in BC Roy chances are very low for computer science. You have to wait till 3rd round.

Based on your WBJEE rank, you can expect seats in Techno India Salt Lake Institute, same link can be used to check eligibility for Heritage College. Branch choice should be based on your field of interest. Looking at current trends, IT companies are offering jobs in great numbers so Computer Science and Information Technology will be good option to look. But before making any choice, do consider your field of interest.

WBJEE 2018 College Predictor
Use your WBJEE 2018 rank to see where you can get admission at the link provided below:
See the courses, colleges & rounds you may crack
The result is based on admissions data of WBJEE 2017
Get resources & insights on colleges & courses
https://www.shiksha.com/b-tech/resources/wbjee-college-predictor.