Dear Aspirant,  JEE Mains 2021 is yet to completed. NTA will release notice for JEE Mains 2022. Most probably first session of JEE Mains 2022 will be in February 2022.

Once NTA releases notice for it you can register for it on NTA website

https://jeemain.nta.nic.in/webinfo2021/Page/Page?PageId=3&La (https://jeemain.nta.nic.in/webinfo2021/Page/Page?PageId=3&LaCheck)

Check this out:

https://learn.careers360.com/jee-main-rank-booster/?icn=jee-rank-booster&ici=c360-Exam-View-WEB-Sticky

https://engineering.careers360.com/download/sample-papers