Hi

You can do B.Sc in Computer Science in West Bengal through these open universities:

1. IAS Academy, Jodhpur Park, Kolkata
2. Netaji Subhas Open University, Sahapur, Kolkata
3. Indira Gandhi National Open University, Maulana Azad College Study Centre, Kolkata
4. Directorate of Open and Distance Learning, Kalyani
5. Netaji Subhash Open University, Chakdaha

Hope this helps.
Cheers!