To,
The Principal,
School Name,
School Address
Subject: Application for Sick Leave
Dear Principal,
I hope this message finds you well.
I am a student of Class 12, and I am submitting this application to request sick leave.
I have not been feeling well for the past 2 days, so I went to my doctor for a checkup, where I found out that I am suffering from a high fever.
My doctor has advised me to take full bed rest for one day. I kindly request you to grant me one day of leave from 1 March to 2 March.
I will complete the homework and assignments from home. I hope you will consider my application seriously and approve it as soon as possible.
Thanks!
Yours sincerely,
[Your Name]