IIM Calcutta is one of the most prestigious B-Schools in India and has an amazing college life. The MBA specializations that are offered by the institute are

MBA - The flagship program offered by IIM Calcutta

Executive MBA - For working professionals

Executive PGP Visionary Leadership and Manfacturing

The other course offered in IIM-C is Post Graduate Diploma in Business Analytics. Apart from these , you can also pursue PhD in Management of your choice there.

Hope this answer helped you! Good luck for your future.