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Message to Readers
I didn't change it much because I didnt know how to make it better but thank you for reading!
I like the tone. It sounds like a friend writing to another friend; it is so casual and nonchalant. It also brings up the past between these two friends and their relationship.
You could mention what specific fun the two friends have, and how they annoyed the teachers. Bring up instances and examples to really draw readers into the letter.
What happened to this friend? How did these two become friends? How did they get in trouble with the teachers?
You have a very light-hearted tone and are able to make this fun and full of friendship despite the more solemn topics you discuss.