Hello Aspirant,

Unfortunately, you will not be eligible for JEE-Advance 2021 if you have passed your class 12th in 2019 because as per the latest eligibility criteria of JEE-Advance you can attempt JEE-Advance for only two consecutive attempt in two consecutive years after passing class 12th. So as you have passed your class 12th in 2019 so you could have appeared for JEE-Advance 2019 and 2020 only. If you have not appeared either in JEE-Advance 2019 or in 2020 then also you cannot be eligible for JEE-Advance 2021.

You can refer to the link given below for more information :-

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-advanced-eligibility-criteria/amp

I hope this information helps you.

Good Luck!!