Dear student,

First of you must tell the examination name that during registration of which exam you have given wrong roll number.

So, I am assuming that you are filling jee mains form. So, if you have given wrong class 12th roll number, then yes, definitely you can change that in the correction window.

For jee mains February session the correction facility will open from 19th january to 21st January 2021.
So, you can correct your details in between 19th to 21st january.

Also you can check out the following link to know more about jee mains correction window :-
https://engineering.careers360.com/articles/jee-main-application-form-correction/amp