Hello
As we can see the previous trend of a few years that in order to score 90 percentile you need to have a score of at least 70 to 75 marks so as you are asking about 100 marks so your percentile must be above than 90.This is just the probable range of marks because it varies for particular sessions. It shall totally depend upon how difficult the question paper was and how many students appear in the exam and how they performed in that examination .
Hope it helps

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