Hi

With your 12th passing year in 2020, you  were eligible for JEE  main 2020 , you are eligible for jee main 2021 , and also will be eligible for JEE  main 2022

This is because,

One can give JEE Mains entrance examination for a maximum of 3 consecutive years starting from the year of passing 12th board examination.

Now,

your year of appearing for 12th board examination is 2020 and thus eligible for jee main 2020, jee main 2021, and jee main 2022

For details visit,

https://engineering.careers360.com/articles/jee-main-eligibility-criteria

If I tell you about jee advanced then,

One is eligible for JEE advanced examination for a maximum of two consecutive years starting from the year of appearing for 12th board examination.

Now, your 12th appearing year is 2020

So, being appearing for 12th board examination in 2020 ,you were eligible for JEE advanced 2020 and you are eligible for JEE advanced 2021.

You can check detailed eligibility criteria of JEE advanced by visiting our page the link for the same page is provided below

https://engineering.careers360.com/articles/jee-advanced-eligibility-criteria

If you have any other doubt then you can always reach us to clear them :) we are always available to help you out and guide you

Thankyou