Hello

It would be difficult to tell you the marks on the basis of your percentile score and also it is difficult to calculate the exact rank. You may check your probable rank using the Rank Predictor tool.

https://engineering.careers360.com/jee-main-rank-predictor

Also, based on your percentile, chances seems to be less for qualifying the exam and getting admission in NITs. You should appear for the JEE Main April exam and try to perform better in that exam.
Good Luck!

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