Hello,

If you have submitted the JEE-Main 2020 application form for both paper-1and paper-2 along with application fee than you are enrolled for both the papers.

You have to appear for both papers. Don't worry about timing of papers, papers will not conduct simultaneously.

At last it's your wish, in which paper  you want to appear or you can appear for both the papers.

For more details about JEE-Main 2020 you should read this article .

Feel free to ask any query.

Good Luck!!