There's an alien in my classroom! - Bruce Coville

When the first Ambassador to Earth sends his son, Pleskit, to a state school, the young alien has to deal with all the same things new kids in school have to cope with (he doesn't fit in, his father is a dork, no one understands him) only on a much grander scale. This is the first of twelve stories told by both Pleskit and his classmate, Tim, as Pleskit makes friends and enemies, meets girls for the first time, gets a bad report card, deals with prejudice and uses his superior knowledge to shrink the teacher. Told in the inimitable Coville way, with slapstick, humour and (just once or twice!) a little bit of insight into the human condition, these are a must for all Coville fans.