You cannot calculate score from percentile.

the percentile days you're the relative position among the candidates who appeared for the exam.

Percentile indicates the percentage of students are behind you out of all those who appeared for the exam.

If you have your choices marked in the exam and interested then you can cross check and calculate the score

Hello Dear ,
Its difficult to predict actual rank or JEE advanced qualify marks. you may calculate your expected rank by this formula

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. If the number of candidates for April exam increased to 1200000 then your final rank shall be (100 - your total score) X 1200000/100

Its difficult to tell exact qualifying marks for jee advanced eligibility but if you are getting more than 85 percentile score then you have decent chances to qualify for jee advanced
You can have a look to college predictor , it will be helpful to you in finding your college.

Wish for your bright future.https://engineering.careers360.com/jee-main-college-predictor

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