Dear student,

In the passing year you must select the year in which you have passed the class 12th for the first time. That is, you have to select 2019 as your passing year. And if it asks for improvement then click on yes.
And give your improvement marks during registration.
Don't select the passing year as 2020, because you have passed your class 12th in 2019 and you have the passing certificate for 2019. Improvement exam is just for upgrading your marks. No separate certificate will be issued for this, instead only a new marksheet is issued.

So, give your improvement marks for jee mains 2021 by keeping your passing year as 2019.

Check out the following link to know more about registration of jee mains :-
https://engineering.careers360.com/articles/jee-main-application-form/amp

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