See as your Percentile is 70 this means that you have cleared Cutoff in SC category because this year's Cutoff for SC was 54 percentile. Now you want to take admission in NITS. But as per my knowledge your marks would be around 41-50. You can check your expected marks in this link also created by Careers 360.

https://engineering-careers360-com.cdn.ampproject.org/v/s/engineering.careers360.com/articles/jee-main-marks-vs-percentile/amp?amp_js_v=a3&amp_gsa=1&usqp=mq331AQFKAGwASA%3D#jeemainmarksvspercentile2020

Now it is Difficult for you to get into NITS. But don't lose hope miracle can happen.You can predict your college according to your Rank vs Marks vs Percentile Created by Careers 360.

https://engineering.careers360.com/jee-main-college-predictor?icn=JEE_Main_clgpd&ici=JEE_Main_article_view_sticky

Hope you understand this very Well and All the Best..

May God bless you ..

Thanks and Have A Very Nice Day..