I Was a Sixth Grade Alien - Bruce Coville - Bog

MY BEST FRIEND IS A ZOMBIE!
It''s science fair time again, and Tim Tompkins is in trouble. It''s only two days until the big event, and he hasn''t finished his project.
In fact, he hasn''t even started it.
Given Tim''s past history, this is no big surprise.
But this year Tim has a new resource -- his alien friend, Pleskit Meenom. Surely with his super science, Pleskit can help Tim come up with a knockout project for the science fair.
But Pleskit''s potent potion turns out to have side effects that not even an alien could have expected, and soon he''s desperately trying to answer the question: "What do you do when you''ve just amputated your best friend''s personality?"