Hi, dear principal,

i am afraid i will not be able to sit in the  half yearly examination because i am suffering from (ANY MADE UP DISEASE)  and its rare. so i have an allergic reaction to it. hope you understand my problem

yours sincerly

(your name)
The Principal Excellent School New York September 19,2015 Sir I am a student of class 9th of your school. Due to high fever ,I will not attend the half year exam, so I will not come for a week because doctor says that take rest for a week. In these circumstances , I request you kindly to avoid me from the exam. Next week I will surely write the exam. If you have any doubts ,call my parents and ask about me and sir, i will surely request to give me new question for the exam because I am very sure that I can give answer to any question because of high fever I will not come otherwise l will surely come to attend the exam. I hope you will kindly accept my request Thanking you Your obediently Surya