It is impossible to predict CAT score because sometimes 90 percentile candidate get admission at IIM  and sometimes it gets low as 60 percentile.there is drastic change in percentile.

CAT takes admission considering following factors 10 and 12 percentage,graduation and work experience.

You should score high as you can and prepare for interview as well.remember only deserving candidates can get into IIM'S.

ALL THE BEST!!