Even though you have scored 100 percentile but still you will not get a call from IIM A/B/C. IIMs take a composite score which involves your past academic records and work experience along with your CAT scores.
To promote diversity at their campus they have further tweaked the admission criteria which makes a certain group of people at a disadvantage already. These are GEM – General, Engineer, and Male. If you belong to this category and have low academics or no experience then even if you have 100 percentile, you may not get a call from the IIM A/B/C.