Assuming your are a General Category Aspirant, from Engineering Background, having a strong academic record, you should secure atleast anywhere around 99 Percentile, to secure a Call from one of the IIMs as well as between 98-99 for CAP. Incase you are Targetting IIM ABC, you need to raise your targets to anywhere above 99.5+ for better chances and prospects.

For more information about CAT do follow the link below

https://bschool.careers360.com/exams/cat/amp

For more information about IIM Percentile Cutoffs do follow the link below

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