Write an application to principal of your school for exempt to appear half yearly exam as you suffering from chicken pox.

Dear Student,
Such questions are made for enhancing the self-creative skills and should be tried answering on your own. However, here are a few points that will help you in framing your answer:
 

Dear Ma'am,

Subject: Requesting exemption from half-yearly exams 

I am XYZ, a student of class VIII in your school. I am writing this letter to inform you that I have contracted Chicken Pox. I would like to request your permission, to not attend the exam which has been scheduled for tomorrow. I need bed rest for 15 days to be able to feel healthy again. Moreover, if I were to come to school and write the exam, I would risk the lives of my friends too. I would be grateful to you if you could exempt me from writing this year's half-yearly exams. 

Thanking you in anticipation.

Yours truly,

(Name)
 

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