Hello student,

As you have mentioned that you have secured 85.93 percentile. Though the cutoffs of nits and iiits are also very high. The admission is also based on the category you belong to. The chances are quite less for you. However you can predict your rank from the provided link:

Hey Aspirant , The cutoff changes every year depending upon the difficulty level of the question paper, the number of candidates appearing in the examination and the category of the candidates, etc.
You can use the the College Predictor of Careers360 to predict your chances in the college using the link given below:

I hope this will helps to you and thank you !!!