Hello
It would be difficult to tell you the percentile required for admision into NIT. JEE Main 2019 exam is to be conducted twice a year by NTA for the first time and scores will ne normalized on the basis of Computer Based exam and two attempts.
You can go through the link below and use the college predictor tool to check your expected chances in Engineering Colleges
https://engineering.careers360.com/jee-main-college-predictor
Good Luck!
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