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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Hello

It is difficult to calculate the marks using the percentile score. Expected rank can be calculated using the Rank formula which is as follows:

100 - your total percentile score is the percentage  of people ahead of you. 869010 are the number of candidates appeared for Jan exam.
So rank formula is (100 - your total score) X 869010 /100.

Your expected rank would be 234632.
It should be noted that , if the number of candidates for April exam increased to 1200000 then your final rank shall be (100 - your total score) X 1200000/100

Also, if you belong to the general category, chances are less to qualify the exam and appear for jEE Advanced. I would suggest you to appear for the JEE Main April exam and try to score better in the april attempt.

With this percentile, chances to get admission in colleges through JoSAA Counselling would be tough. If you wish to know about your admission chances through state level counselling on the basis of your percentile, use the JEE Main College Predictor Tool-

Good Luck!