If your roll number is missing, here are some general steps you can take:

1. Contact your school or institution immediately.

2. Reach out to your class teacher or examination department.

3. Check your admission documents or online profile (if applicable).

4. Verify your enrollment details with the school administration.

5. Request a duplicate roll number or admission card (if possible).

Remember to act quickly to resolve the issue and avoid any potential delays or complications.