IIM Bangalore - Indian Institute of Management

Either 75% or Among Top 20 Percentile in Qualifying Exam:
Candidates should have secured either 75% in Qualifying Examination or should be among Top 20 Percentile of respective School Board.For the SC / ST candidates, the minimum marks percentage in Qualifying Examination is 65%.

https://www.shiksha.com/mba/cat-college-predictor
Here is the tool predictor which you can use to check the excepted college based on your score range

Doctor of Philosophy Ph.D. Five-year fulltime programme. Master of Business Administration (MBA), Two-year fulltime programme. Master of Business Administration (MBA), One-year fulltime programme. Master of Business Administration (MBA), Two-year weekend programme.

The expected CAT percentile cutoff of IIMs for asked category are given below.
1. IIM-A
Sectional cutoff=60
Overall cutoff= 70
2. IIM-B
Sectional cutoff= 60
Overall cutoff=70
3. IIM Kolkata
Sectional cutoff= 65
Overall cutoff=70

It seems too difficult to get any IIM, still, you can try and hope for the best.

Yes, you will get admission if your CAT score is above 98+. Hope for the best.

As per your previous marks, chances are less, but still, if you try to score above 98+ in CAT then, maybe you will be callwd as an interview.

At least you have to score 95+ in CAT to get the call for an interview.