Hello,
It is difficult to tell you the marks which brings you 90 percentile.
Percentile is the percentage of candidates who have scored equal or below marks than you.So it differs with number of candidates scored equal or less marks than you.But if your overall score must in between 68-87 marks and your score in individual subjects must be above 25 marks then you may get 90 percentile.You need to work hard and you must have good accuracy while answering the questions.Make sure that you don't answer the questions which you don't Know.

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