Hi Aslesha,

If you will get 80 marks in JEE Mains 2020 then your percentile would be around 91 percentile.

However, this is not exact but only approximate.

If you get marks between 87 to 78 than your percentile would be around 92.61891464 - 90.64227869 percentile.

You may refer to this article for more information about JEE Main Marks vs Percentile list.

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!