____________ (School Name),
Date: __/__/____ (Date)
Subject: Leave request
Respected Sir/ Madam,
I am _________ (name), a student of ________ (class) of your reputed school.
I am writing this letter to inform you that I will not be able to attend the class today. The reason behind the same is that I am suffering from a high fever. I ensure that I will be joining back as soon as I feel better and I also ensure that I will arrange to submit the due deliverables/ complete assignments if any.
I hope that you would consider this as a genuine request.
___________ (roll number)