Hello Kishan

Marks scored in the JEE Main exam could be calculated from the respose sheet of the candidate. NTA has released the question paper and the response sheet of the candidate and candidates could check it by logging into their account from January 14 to January 17.
Marks could be calculated according to the JEE Main marking scheme.
Check the details- https://engineering.careers360.com/articles/jee-main-answer-key

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Marks cannot be calculated using the percentile score but you can check your expected rank in the JEE Main exam using the rank predictor tool

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

Good Luck!

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