Dear Aspirant,

Check this Marks VS Rank VS Percentile analysis for JEE Mains 2021:

https://engineering.careers360.com/articles/jee-main-marks-vs-percentile

According to this with 100 marks percentile  would be around 96.01.

Also you can check this :

This Rank predictor tool gives possibilities on Percentile,Rank specific to paper difficulty and each session of JEE Mains 2021 , so that you can check percentile according to your shift and sessions.

Also for remaining JEE Mains attempts these might help:

1. https://engineering.careers360.com/articles/jee-main-preparation-tips
2. https://learn.careers360.com/knockoutfull-jee-main-april/