MBA/PGDM

A graduation degree in any field from any recognized university in India with minimum 50% in graduation.

IRMA is the best institute for rural management. The entry is through CAT and second stage test of issues of rural concern.
Welingkars also offers rural management program in distance learning mode. You can attend your lectures and give your online exam from anywhere in India.
You can check the below

Christ University has less fees as compare to XIME, SIBM Bangalore etc. but it is not that good as compared to them.

To pursue MBA, you need to have a graduate degree.

PGPX is better in terms of salary prospects, but 2-3 years of work experience is good, but more than that creates a problem. Some companies may think, it is difficult to change their perception and way of working after certain period of time.
2 years of work experience on the other side gives you the

There are some exams, which should be taken to pursue MBA like CAT, MAT, XAT, SNAP, CMAT, NMAT, etc.

Yes, you can pursue MBA in marketing. Marketing course is easy and can be learned with inputs of hard work + smart work. There is no such criteria that B.Com finance students can't go for marketing. There are immense opportunities after MBA-marketing.