Hello dear
Percentile system is based upon the number of students who score more than you and total number of students who give exam.
So it is difficult to calculate marks.
Because percentile can be different at same marks in different slots ( eg. Even you score 200 or 150; but in both case the number of students who score more than you is same than your percentile remains same ;
And if you score 200 in both case but number of students who score more than you is different in both ; than your percentile is also different).
So hope you got my point.
But further ; according to last year's in 90 percentile your score may be in the range between 90-120 .
Good luck.

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