Hello.

It depends on your rank rather than your score if you can get into an NIT. The marks vs rank keeps changing each year along with the cutoff due to various factors like difficulty level of the exam and the average score of students etc. You could use the rank predictor to get an accurate estimate of your rank:

https://engineering.careers360.com/articles/jee-main-rank-predictor

You could then refer the cutoffs of previous years:

https://engineering.careers360.com/articles/jee-main-cutoff

Hope this helps.