You will always have the option to go from a double to single occupancy and vice versa. The hostels have a capacity that exceeds the annual intake. As a result, once you arrive, this should not be an issue.

But If you are concerned about expenses, then take a double occupancy room and then shift your room among your friends. Or you can book a single occupancy room, that way you will have your own personal space than without any disturbance.

My brother completed his PGDCM from NICMAR Pune. The placement in NICMAR Pune is really good. In comparison to other civil engineers, you will be paid slightly more. The only disadvantage is the high fee structure of the institute. 

The current placement stats of NICMAR is as follows. 

I recommend that you acquire a job and take a NICMAR part-time or distance course. You will be given the name NICMAR and will have to spend less money. In addition, you will not lose your two-year income or experience. So, it's best to get a job first and then enroll in NICMAR.