Hello Parmar Meet,
You have to be in top 20 percentile of your boards to be eligible for admissions into IITs/NITs/IIITs/GFTIs. For more details regarding the same, visit the following link:
https://engineering.careers360.com/articles/top-20-percentile-of-class-12-boards-for-nits-iiits-and-cftis
Best Wishes!
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile