WBJEE

No, you cannot get any government college.

Your rank is not that much good so from my opinion, you will get an average rated private college, and you can also check the rank predictor of WBJEE.

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.

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.

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

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.

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.

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

Yes, please give it a try