Dear student,

The simple answer to your question is - YES.

During the form filling of jee mains application form you have to be very careful. And as you have filled class 11th hall ticket number, then your application from will be rejected.
Because you have to fill class 12th details.

So, if you have done mistakes than rectify it when the correction window for jee mains will be available.

Because if you don't take any action then, your form will be rejected or your candidature will be canacelled and you will not be able to give exam.
So, it's better that you wait for yhe correction window and then rectify your class 12th roll number in that.

Also check out the following link to know note about jee mains 2021:-
https://engineering.careers360.com/articles/jee-main-application-form/amp

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