Hello Aspirant,

See there are two cases, so let us discuss about first case, you are eligible for JEE-Advance 2021 if you have qualified JEE-Main 2020 and was unable to attend JEE-Advance 2021 due to either being COVID positive or belonged to any containment zone but on the other hand in normal conditions second case will be there and you are not eligible because maximum attempts allowed for JEE-Advance are two in 2 consecutive years which includes the passing year of class 12th as well. So as you have mentioned that you had passed your class 12th in 2019 then you were eligible only for JEE-Advance 2019 and 2020. For complete details about JEE-Advance eligibility criteria kindly check out the link given below :-

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

But yes if you have appeared for JEE-Main 2021 as you are eligible for it so you can use JEE-Main College Predictor to predict your chances of admission in different engineering colleges of India :-

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

I hope this information helps you.

Good Luck!!