Magic Tree House
Junie B. Jones
Aliens have finally made contact with Earth and have sent an ambassador-a single parent who brings along his kid, Pleskit. Because his father insists he mix with earthlings and attend public school, Pleskit becomes the world's first sixth grade alien. His initial attempts to fit in are hilariously catastrophic, and only when he establishes a tentative friendship with Tim Tompkins does Pleskit begin to understand that he is being sabotaged. But by whom? And why?
I WAS A SIXTH GRADE ALIEN is the first book in a 12-book series.