Hello,

I hope you are doing well, as you mentioned your JEE mains percentile is 71.8 in 2021 and you belong to SC category. With regrets i would like to say that you won't be able to get NIT's or even GFTI with this percentile. If you want to get a seat at NIT's/IIIT's/GFTI the you must score minimum 92 percentile or above. You can still check the colleges with the percentile you scored with the college predictor link -

https://engineering.careers360.com/jee-main-college-predictor?utm_source=qna&utm_medium=jee_cp

I hope you find this information helpful. I wish you all the best for your future.

Good Luck