Hello,

Each NIT has it's own cut off so it is difficult to predict the exact percentile. To have decent chance of getting seat in Computer Science you need to score minimum 90 percentile in JEE main. Cut off may increase or decrease depending on number of candidates appeared, number of candidates applied to the course, category, merit etc.

We have JEE main knockout package to help you with your preparation

https://learn.careers360.com/knockout-jee-main-april/