Hello Aspirant,

See it is quite difficult to tell you an exact figure of your expected marks because it keeps on changing every year depending upon various factors but yes we can help you with approximate figures on the basis of analysis of previous year's data. 
So If we go through the analysis of marks Vs Percentile Vs rank for JEE-Main 2021 then according to the percentile mentioned by you in the question your marks are expected to be in the range of 85-100 but it more depends upon your shift of attempt.

You can check out marks Vs ranks Vs Percentile from the link given below :-
https://engineering.careers360.com/articles/jee-main-marks-vs-percentile


Note that the marks which are predicted is only the expected marks on the basis of previous year's data so your actual percentile  and rank might vary depending upon current factors.

You can also take JEE-Main Learning package for solving series of mock tests :-

https://learn.careers360.com/knockout-jee-main-april-one-month-subscription/?icn=jee-main-knockout&ici=c360-clevertap-sticky-articles-web

I hope this information helps you.
Good Luck!!