Hyy Tapas
Eligibility for MA/ Msc psychology is you must have 10+2 with 50% + Psychology as a subject in your Undergraduate Course.

Admissions are based on Entrance as well as Merit basis depends on the Institute.

If you had psychology as your subject in Graduation with Bengali Honor's then yess, you can persue Post graduation in Psychology.

Hope this helps you out.
For more information about eligibility or course please ask in comment section