Hello soumik,
You percentile is very low to get admission in CSE department of NITs,
Although you can checkout your rank through the link provided and you can use it to get the Colleges you can get by our college predictors through jee mains.
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer
And for rank predictor-
JEE Main Rank Predictor - Know your expected IIT JEE Main 2021 Rank by ...
I hope it helps
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