Hi Abhijeet! 

Your working experience and your marks were really good. But to get a call from IIMs you have to get a percentile of 90. It is calculated based on CAT score i.e from 60 to 80% and the remaining percent is from your work experience and marks. I am quite sure that you may get good percent based on your work experience and marks. So the only thing you have to do is concentrate on your Common admission test(CAT).

ALL THE BEST!!