Hey dear,
With 85 percentile marks,it is difficult to take admission in NIT or IIT...you can give jee advanced exam and score in that much better and there are many other good private and government colleges like thapar university,pec chandigarh etc, by JOSAA councelling in which you can take admission with this percentile.
Here is the college predictor after jee mains
For accurate knowledge of college you can get

Here is the predictor for the rank conversion so that you can know your rank for cutoffs

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