Hello.
the cutoff of NIT is basically on the basis of rank which you have in JEE mains , it is difficult to predict your exact rank but you can calculate your approximate rank by using the below formula:
((100-your percentile score) X total number of candidates appeared for the exam)/100
Total number of candidates appeared for the January exam: 869010
now by using the above formula you will calculate your approximate rank which would be : 141,909 (this rank is van if we are not considering any category wise rank) and using this rank you can predict the college/NIT which suits on your percentile by using the previous year cutoff list of JEE mains from the below link:
https://engineering.careers360.com/articles/jee-main-cutoff
Or you can predict your college by using career 360 college predictor tool from the below link.

Best of luck.

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