MBA/PGDM

No, they don't require CAT or any other MBA entrance exam for PGPM + MBA.

No, it's not possible. Once you have paid the fees will not be refunded.

University of Bremen is the best university in the Germany for MBA and fees is around 20000 in Indian rupees.

No, its not that hard. You have to appear certain tests if you get selected, then you can take admission.

Since, I am a student of BIBS I won't showcase any college as bad but BIBS will provide you much more things than only theoretical knowledge. Its events will give you immense confidence to step out in the corporate world.
Thanks.

If your MAT is not cleared, you can switch to some other colleges which will be according your interest area.

It's now not possible as you have already got admission in your according your choice. It's according to your rank and MAIT is a nice college and have good education quality.
Good luck

Being a 2nd year student you do have a lot of time to prepare as next year would largely be focused on your training and the final year on placement. Start preparing bit by bit on your own. Build a strong vocab in next few months followed by writing skills and than appear for a mock or two every month. This would ensure your continuous evaluation and would help to improve until the final day. Give your GMAT in the final year staring as this would help you with enough time to apply for the scholarships and other financial aid.