Write an application to the Principal of your school to exempt you from attending the compulsory games in the evening

Madam,

I beg to inform you that my brother is not well. I have to look after him. There is nobody at home to attend him.

I am interested in games and sports. I am a hockey champion of our school. But I am unable to participate in the compulsory school sports practice in the evening. So, kindly exempt me from coming to the evening games for the practice for ten days.

Thanking you.