Hey,

To get into IIITs, the minimum percentile required is 98.89.(let's round it off to 99 percentile)

Hence, it would difficult for you to land up in the IIITs.

Rank corresponding to 91 percentile is around 78, 703. For a student belonging to general category, 91 percentile could not place them any of the reputed NITs.

Hope this helped you

Thank you :)