I got 949out of 1000in board exams and I have scored 83.4percentile in Jee mains (of category)
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Since you got 83.4 percentile in JEE Main 2020 hour rank will be
Rank= (100-83.4)869010/100
So your rank will come out to be 1,44,255. With your tank it is not possible to get admission in NITs or IIITs via JEE Main. However you're eligible for giving JEE Advanced exam.
You can predict your college through JEE Main here.
https://engineering.careers360.com/jee-main-college-predictor
JEE Main 2025 College Predictor
Know your college admission chances in NITs, IIITs and CFTIs, many States/ Institutes based on your JEE Main result by using JEE Main 2025 College Predictor.