Ok dear my provide a list of some govt colleges for B.Com in West Bengal.

1.Government Girl's General Degree college http://govtgirlsekbalpur.com/

2.jadavpur university http://www.jaduniv.edu.in/

3.Maulana Azad college http://mackolkata.ac.in/

4.Netaji Subhas open university http://www.wbnsou.ac.in/

5.University of CALCUTTA https://www.caluniv.ac.in/

Please visit the official website of these colleges for more information, the link I already mention and further help feels free to mention in the comment section.

All the best dear