Hello student marks vs rank prediction is tough as in Jee main results NTA hasn't declared the marks of students they only declared the percentile of each subjects you can calculate your rank with the help of your percentile by using this formula.
(100 - your total percentile) *869010 /100

You can also check percentile vs marks chart for an overview of your marks with your percentile.

Refer to the link mentioned below -
https://engineering.careers360.com/articles/jee-main-marks-vs-percentile/amp

Feel free to comment if you have any doubt
Good luck

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