Hii!
There are a number of Colleges ( both government and private ) in West Bengal providing MBBS course. I'll list down for you, some of the Colleges with relatively low fees, than others.
* IPGMER, Kolkata
* Calcutta National medical College, Kolkata
* Kolkata Medical College, Kolkata
* Midnapore Medical College and hospital, Medinipur
* Burdwan medical College and hospital, bundwan
* RGKMCH, Kolkata
Etc.,
Hope this helps.
Good luck!