Securing a seat in any IIM is difficult, especially IIM Ahmedabad, Bangalore, Kolkata, Indore, Kozhikode, and Lucknow. A percentile of 99 or 100 is not particularly enough for acquiring seats in the institutes mentioned above. The cut-off, however, differs from one year to another.
You must have 90% in your 10th and 12th examination, alongside 80% in your graduation.
However, with scores you have achieved, you still have the opportunity to grab a seat at IIMs that are located at Jammu, Simaur, Sambalpur, Gaya since they are recently established. Apart from that, you still have the open option to choose other B-Schools that are comparably better than the newly established IIMs.