See getting into Indian Institute of Management is the dream for almost all the people who want to pursue a masters degree in management. The ways and steps which you'll have to follows are:

• Select a good coaching for CAT preparation as this is very important.
• Give CAT with full confidence and score well in it
• Get an interview call from IIM Calcutta
• Give the interview nicely!

If you follow these steps, then you'll definitely land up at IIMC. Hope I have answered your question. All the best!