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.

Hello

Marks cannot be calculated from the percentile score. Marks could be calculated from the answer key which was released by the authorities. Official marking scheme had to be followed by the candidates for calculating the marks.
Question paper and the response sheet of the candidates was released by NTA.

You may use the Rank Predictor tool to check your expected rank-

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

Good Luck!