Hello Harshit

JEE Main exam was conducted in multiple sessions and therefore the raw marks have been converted into the percentile score using the normalisatin process by NTA.
Calculation of marks would be difficult. Marks could be calculated from the response sheet of the candidate which was released by NTA.

Using your percentile score, you can check your expected rank. Go through the link below and use the Rank Predictor tool to check your expected rank-

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

Good Luck!

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