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A candidate can appear for JEE Main for 3 consecutive years from the year of passing in the qualifying examination. As you have passed class 12th in the year 2020 you can appear for JEE Main 2020, JEE Main 2021 and JEE Main 2022. And a candidate can appear for JEE Advanced for two consecutive years from the year of passing in the qualifying exam so you can appear for JEE Advanced 2020 and JEE Advanced 2021 provided you must have qualified in JEE Main 2020 and JEE Main 2021 respectively. You are not eligible to appear for JEE Advanced 2022.