how much cat percentile is required to get into iim for st category ? although i got 93% in tenth and 92%in intermediate and bcom with 70%

Hi pya, the cutoff varies every year based on various factors like, number of seats available, number of test takers, difficulty level of exams etc. However generally the cutoff is around 50 percentile in the top and old IIMs like Ahmedabad, Bangalore, Indore, Calcutta etc. And it is around 40 percentile for new IIMs and 25-30 percentile for newer IIMs. Most of the IIMs would accept the scores you have obtained for the 10th, intermediate and b.com which is more than enough. Please refer to the below link for detailed cutoff details for each IIM,

https://bschool.careers360.com/articles/cat-cutoff