hi,

see in iim mba admission is based on cat score which followed by a gd and oi round, you also need to crack the section wise cutoff like verc, quantitative aptitude, reasoning, the cutoff scores varies and different for different iims, however iim also evaluate academic score along with cate score, you need to score more than 95 percentile which is decent score to get calls from iims, for last years cutoff follow below link,

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