我需要初中水平英语作文60字,i want to say sorry to一个人?

道歉信吗？

Dear Mei,
I am sorry that I had turned you down last Saturday when you invited me to your birthday party.The reason was that I was rather behind with my school works and home works.Besides,our end of term tests are only days away.As you know that I am struggling with every subject,which require a lot of my attentions right now,if I want to do well in the tests.I promise you that after this I shall make up to you and go shopping with you every Saturday.Will you forgive please?
Best classmate of yours
XXX