Hi Karthik, hope you are doing well, with your percentile of 83 you can not get CSE in any nit because cse is of craze right now but you can try for other streams if you really wish to get into nit with your percentile. To know more about the admissions through jee mains, go through the rank predictor in jee mains in careers, the link for rank predictor is provided below

https://engineering.careers360.com/jee-main-college-predictor

I think it helps you!!!

Keep  Smiling:)

Wish you good luck!:)