MBA Entrance Exam

The cutoff through MAH CET is above 97 percentile and CAT being an All India level exam the cutoff is 99 percentile.

MDI, FMS-Delhi University, IITs, NITIE , NITs, BHU etc are other top institutes which use CAT score for admission in their MBA programs.

If you want to take admission into the top 20-25 B-schools, you need to given exams like CAT, CMAT, SNAP, XAT, etc and not ATMA and MAT(as the no. of good colleges are very less). As long as you have at least 50% marks in graduation, you're eligible to appear for all of these exams. https://www.shiksha.com/mba/articles/20-mba-entrance-exams-you-can-take-this-year-blogId-11473 Kindly visit this link for more information about these exams.

The cut-off of JBIMS is generally 99.7 percentile and above (for CET) and 99.9(for CAT). So, accordingly, you need to score in these exams. And since JB participates in the CAP rounds, your past academic scores won't matter at all. Just score above the cutoff and you're safe.

You are advised to start your self preparation now and then opt for one year duration coaching for CAT 2018 starting in Nov Dec 17. This will give you sufficient CAT preparation time without impacting your B.Sc studies.

It looks a little difficult. Which colleges are you targeting? If you are trying for premium institutions, then you need to spend more time on improving your English and maths.

Most students apply in Chetana's Ramprasad Khandelwal Institute of Management & Research using their CET or MAT scores. I am not sure about the acceptability of ATMA scores. You can get in touch with the college office on the following number: 022 26513346.
All the best to you.

CAT and XAT are toughest exam. You would need more preparation for these exams.

Apply for Acharya B-School, Bangalore, and Alliance University, Bangalore. These are good colleges in Bangalore. Also, School of management is a good option, but the admission will depends on number of students apply for it and their marks of management score. But, don't miss this year's admission, apply for these colleges, there are chances you might get interview call.