The Principal,
Stars School System(name of your school).
Subject: Application for Sick Leave
Respected Madam/Sir
It is to inform you that I am student of class X( Input your class). I have got severe cholera(name of disease ) and due to this I am not able to be at campus for about three days(days you may be absent). I want you to kindly grant me leave for 6th to 8th June, 2015(date on which you will be absent). I am already having treatment and I hope to recover from this illness soon. I shall be thankful for your consideration.
Yours Obediently,
James Steve(input your name)
Class X(input your class )
Reg num: 200.