Hello Nitesh,

In CAT Exam, there is Sectional cutoff for all the three sections which is around 70 percentile for OPEN Category and around 60 for others along with a overall cut-off of 80 percentile.

Https://www.google.co.in/amp/s/bschool.careers360.com/articles/cat-cutoff%3famp

For top three IIMs, you would get call for more than 99.5 percentile only, if you are general engineer male and if you are not from engineering background you can expect a call at 98+.

So, its very challenging and your overall percentile will determine the chances of gettting a call with minm sectional cutoff 70 in all three section is mandatory to get call from IIIMs.

Hope it clears your doubt.

All the best