Added letter
Added word (optional)
Added punctuation
Removed letter/word/punctuation

Capitalized/made lowercase

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My Brother

I have a brother. He is high school student. I think he is growing fast. He is a humorist funny person, so I like to talk with to him., but we can't always meet cause I must study in another city. When I'm alone in my dormitory, I always imagining imagine his jokes (or him joking). Now I really wanna want to go home. :(
Please correct my notebook!

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This is good! Most of the corrections I made were just capitalizing letters at the beginning of sentences. Also, I crossed out "wanna" in your sentence, but if you were just messaging a friend then you can definitely say "wanna" instead of "want to". I just put "want to" because it is what you would use in an important email or in a school paper. If you have any questions or you want me to clarify anything, comment below to let me know!

I'm sorry that you feel sad, and I hope you can see your brother soon!