Hi Aspirant,
Hope you are doing well!! Marks according to percentile differs in every session of JEE-Main as it depends upon various factors like difficulty level of paper, number of candidates appeared and so on.
But according to latest trends you need to score around 200 marks to secure 98 percentile in JEE-Main April Session.
For more information about JEE-Main 2020 you should read this article .
I hope this answer helps you.
All The Best!!
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