Hello manpreet!! 

I must say the choice of your course is really appreciable as it is a high demanding course these days. The best colleges for BCA in KOLKATA are the following-

1. B.P. Poddar Institute of Management and Technology

2.George Group Of Colleges

3. Calcutta Institute of Engineering And Management

4. Barasat Government College

5. Annex College

6. Pailan College of Management & Technology

7. Narula Institute of Technology

These are some of the best colleges of kolkata for BCA . 

Hope it helps you!! 

Good luck!!!