Dear student,
If you score 100 marks in jee mains then you would get around 96% in jee mains. To know more about marks required for scoring a particular percentile you can refer the following link:
https://engineering.careers360.com/articles/jee-main-marks-vs-percentile
Being a sc category student you would easily get a seat in the top 20 NIT's. Here I am assuming that you do not prefer any particular branch. To check which colleges you would get at this percentile you can check from the following link:
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

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