Hello,

To get into IIM you need to appear for CAT.
It is the eligibility exam for admission in IIMs.
Students need to secure 98-99% tile+  to get shortlisted for any of the IIM's interviews.
You will be get selected based on your cat score, Written ability test, and PI or GD score.
You'll be tested in three parameters.
Getting selected based on past education background is one of the selection parameters.
But many things matter like the skills you have acquired.
For placements, you need to meet certain criteria decided by the companies.
You should focus on improving your skills and then try for the placements.