Percentile is calculated by the ratio of the number of values to the total number of values . You cant say/depict your actual score from your percentile. To calculate the actual score you would need to know the number of students who appeared in the examination and the highest score, average cut offs and the highest score. while as marks are calculated based on the right questions you have attempted, out of the total marks you have obtained for the right number of questions marks from wrong questions marked are deducted from the total.

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Dear Aspirant,

Check out this marks VS Rank VS percentile analysis of JEE Mains 2021:

https://engineering.careers360.com/articles/jee-main-marks-vs-percentile According to this nearly around 83 marks percentile would be around 93.4 -93.5.

Also you can use JEE mains rank predictor :

This gives prediction of rank , percentile specific to all shifts of all sessions of JEE Mains 2021.

Hope this helps.