Hi Student...

The roll number on your class 11th marksheet will be your class 11th roll number. If you don't have it, fill in the essential details such as college name, school board, and passing year; even if you don't have it, you can still complete out the rest of the form and submit it; nevertheless, it is recommended that you fill in as much information as possible. Because this has been a recurring issue among many students this year, you may hear from NEET officials shortly. However, you can contact your college for details right now, but if you can't, leave those blanks as a last resort.

Make sure you fill out all of the other fields thoroughly because there's a risk you won't get a correction window afterwards.

I hope this information was useful.

Regards.