For JEE ADVANCED a student can do two attempts in two consecutive years. Thus if you have given JEE ADVANCED 2020 then you are eligible for JEE ADVANCED 2021 and not 2022 i.e., you are eligible to apply on the year of your boards and one year post the year of your boards. If you have missed the JEE ADVANCED 2020 then you are eligible only for 2021.

To know more about JEE ADVANCED visit the link provided below:

https://engineering.careers360.com/exams/jee-advanced

I hope this answer helps. All the very best for your future endeavors!