Stuck on Earth by David Klass

Ketchvar III, a superintelligent alien, arrives on Earth for a mission from his planet to study Earthlings. Tom's body gets overtaken by Ketchvar, and Ketchvar is able to see the world from the point of view of a 14 year-old boy. Will humans pass Ketchvar's test? Or will he destroy them all with his Gagnerian Death Ray?

This novel is both very funny and very, very sad. There's really a little something for everyone: romance, teen angst, and an adventure.

This is a short book that should appeal to seventh and eighth graders, both boys and girls.