Hello.
since it is quite difficult to predict the marks to score a particular percentile because the percentile depends upon the number of candidate appeared for the exam and also the topper percentile actually it is your normalise score which is calculated with respect to the number of students who got equal to and less than your marks so to get 98 percentile you can consider marks that you need to score is  more than equal to 90% of the total marks of that particular area of the exam.
Best of luck.

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