Hi strudent,

As per the previous year cutoffs, if you will get 99 percentile in JEE Main 2021 February attempt then, your marks would be around 150 - 152.

Please note that this prediction is based on previous year cutoff that can change in the coming year as exam pattern and students giving exam changes.

Refer here for more info - JEE Main 2020 Marks vs Percentile – Calculate Marks using percentile score (careers360.com)

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!