Hello Aspirant ,
The arena for management as a post graduation degree is cluttered with millions of aspirants , and there are various exams conducted to grant admission to students but the competition being so steep it is inevitable for students to take coaching for proper guidance
Some institutes for the same in Kolkata are

1.IMS LEARNUNG CLASSES
2. CAREER LAUNCHER
3.  AAROHAN
4. ERUDITE
5. EDEAVORS CAREERS PVt LTD
6. RAVI RAJA'S CLASSES
7. TRIUMPHANT INSTITUTE IF MANAGEMENT EDUCATION PVT. LTD



Hope this helps , all the best best