If you have mistakenly written your serial number and corrected it yourself, it could lead to potential issues. Exam authorities expect that details like serial numbers be filled accurately. While some mistakes may be overlooked, it's always safer to notify your school or the exam conducting authority about the correction. If the correction is minor and doesn't affect other critical details, it may not cause issues, but confirming it with the relevant authorities is recommended to avoid any future complications.

Here is the format:

Subject: Request for Subscription Form for School Library

Dear [Librarian's Name],

I hope this message finds you well. I am writing to kindly request the subscription form for the school library. I would like to enroll in the library services and would appreciate it if you could provide me with the necessary form to complete the process.

Thank you for your assistance. I look forward to your response.

Sincerely,

[Your Name]

[Your Class and Section]