Hello Richard,
It would be difficult to tell you the exact about the qualifying cutoff as JEE Main is being conducted twice by NTA for the first time. Based on this score the chances seems less to get the core branches in NITs. To check your other admission chances you can use JEE Main College Predictor tool given below.
https://engineering.careers360.com/jee-main-college-predictor
You can also check the previous year cutoff with the given below link.
https://engineering.careers360.com/articles/jee-main-cutoff
Good Luck!
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