Respected Sir/Madam,
I am _________ (name), a ________ (student) of your School i.e. ________ (Name of the school).
Most respectfully, I am writing this email to inform you that due to the reason ____________ (mention reason for requesting leave – travel/ health issues/ family reasons/ entrance exam/any other). In this regard, I request you to kindly grant me the leave for ______ (number of days) days from __/__/_____ (date) till __/__/_____ (date).
I shall be thankful for your kind approval.
Thanking you,
Yours sincerely,
_________ (Name),
_________ (Roll number)