It is tough to tell you the exact as the cutoff varies year to year & also it differs to Home state quota/ Other state quota but try to score more than 220 as a General category to get CSE branch. You can check MNNIT cutoff rank with the given below link.
https://engineering.careers360.com/articles/jee-main-cutoff-for-mnnit-allahabad
Good Luck!
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