MBA Eligibility

You can follow this link
https://www.shiksha.com/mba/ranking/top-mba-colleges-in-india/2-2-0-0-0.

You have really good academic scores. There are many colleges where you can apply like:
1) BIMM
2) ISBS
3) ITM Navi Mumbai
4) IIMP, etc.
I'm currently studying in BIMM executive (marketing)
For more information in one particular, also to get discount in filling their admission forms, comment below.

Yes, you'll be eligible but now to many colleges. There would be few. But don't lose hope. There are still good colleges accepting this score.

For doing MBA, one must complete UG with 50%.

Hello,
Unfortunately, you're not eligible to appear for various MBA entrance exams since even for the reserved category candidates, one needs to score at least 45% marks in graduation.

Since MBA is a Masters programme, you need to be a Graduate to pursue it. In case you intend to pursue any form of MBA, then its advisable that you first complete your Graduation. Nowadays, via the correspondence route, one can complete BA in 2 years time.

Yes, they do accept MAT for MBA as you have scored 98.11 percentile. You are one edge upper than average and chances of selection are higher. So proceed and apply for the further steps of admission process.
Best colleges for management amongst top 50 you can check for:
1) Great Lakes Chennai
2) Rajagiri Centre for Business Studies, Kochi (Scholarship available for Meritorious Students)
3) Christ University, Bangalore
4) LIBM, Chennai
5) Tezpur University (Central University)