MBA Entrance Exam

Yes, you can go for Marketing stream. You must choose the stream in which you have interest. Marketing do have good future scope in the field of Market Research, Digital Marketing and Retail Marketing. You can very well opt for that.

Chances seem less at this score, the cutoff is above 75-percentile.
https://www.shiksha.com/mba/course/master-of-business-administration-faculty-of-management-studies-baroda-fms-baroda-vadodara-112403

You need to appear for NMAT and have valid decent score in HSC examination to join 5 year integrated program viz. B.Tech+ MBA or B.Pharm+ MBA offered by Mukesh Patels NMIMS.

You may refer to following link for list of top MBA B-Schools which accept XAT score: https://www.shiksha.com/mba/ranking/top-mba-colleges-in-india-accepting-xat/2-2-0-0-309.
In addition you can appear for IIFT or IRMA exam to join these B-Schools. You can appear in SNAP of NMAT which will help you t

There is no college bias in IIM selection. Selection is purely based on meritocracy. If you crack CAT and do well in GDPI you stand fair chances to get selected in IIMs.

You may refer to following link for list of top MBA B-Schools accepting MAT score: https://www.shiksha.com/mba/ranking/top-mba-colleges-in-india-accepting-mat/2-2-0-0-306

It depends upon the IIM you are targeting, every IIM has different criteria to select students and give different weightage to the graduation marks. Having said that, if there is a genuine reason why you were not able to complete your degree in time, it can be taken into consideration because there

Yes, you can easily get admission with this score. All you have to do is to score well in GD/PI.

IMT Hyderabad and Nagpur are good and even Christ University, XIME Bangalore are good.