With 50.62 percentile in CAT exam, I am sorry to say that you won't be getting calls from any IIMs and not even from the top private colleges like FMS, JBIMS Mumbai.

Many of the top private MBA colleges do not have the reservation policy while giving admission so its very difficult for me to find out the colleges where you can get admission with this percentile. 

If you want to ignore the reservation quota and apply in colleges then there is a huge list of private MBA colleges where you can apply but they won't be of good quality in every parameter like faculty, infrastructure, placements etc.

Make a wise decision so that I can help you in a better way. All the best!!