Hey,
Regarding your query, at first I would like to inform you that without officially released cut-off marks of top and eminent NITs for this year by NTA ( National Testing Agency), we can't make any accurate statement about the precise cut-off marks of any NIT.
So we have to go for the previous year's cut-off details in this regard. Hence I want to recommend you to go through the following article: https://engineering.careers360.com/articles/jee-main-cutoff
https://engineering.careers360.com/articles/jee-main-cutoff-for-top-nits
After thorough analysation of the above provided link, it should be quite clear for you also that since you're an EWS candidate, you've enough probablity of getting admission in top departments of several renowned NITs like NIT Rourkela, NIT Calicut, NIT Agartala, NIT Durgapur, NIT Jamshedpur, NIT Hamirpur etc with this marks and rank.
You can also predict your admission chances in your preferable institutions in JOSSA and State Level Counseling through the Careers360 JEE MAIN college predictor tool:
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer
Hope these informations and above links would be quite helpful for you.
Wish you all the best !!
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile