CAT

Nothing can be predicted beforehand about the no. of questions and/or a score that can fetch you 99 percentile. Percentile is a relative term, which depends upon how the exam is, how the other test-takers have fared in it and how many easy-tricky-difficult questions you've attempted. So, since there isn't any fixed number, it can be anything between 45-70+ questions.

You can apply for MBA at BITS if you have graduation percentage more than 60% and have a good work-experience.

Yes, you have a good chance to get a call.Rest depends on GD PI.
Best of luck!

They don't mention the cut-off. However, the minimum eligibility is 50% in gradation.

The chances of getting an interview call is very less.

Yes, you can apply for MBA at BITS Pilani.

Short-listing for MBA at BITS Pilani is not only on the basis of CAT cut-off but it is also profile based.

You have a good chance through CAT but I would advice you to take CET because through CAT you apply for All India Seats which are very few for MMS where as through CET you get to apply for nearly 70% seats (this may vary).

Yes, you can expect a call for GD PI if you have applied for the college because XIME considers candidates above 70 percentile.

Hi,
You won't be getting any of the top level B-schools. You can still check the below given link:
https://www.shiksha.com/colleges-accepting-cat-scores-range-60-to-70-percentile-article-11984-1