The Strange Case of Origami Yoda by Tom Angleberger
Dwight, a loser, talks to his classmates via an origami finger puppet of Yoda. If that weren't strange enough, the puppet is uncannily wise and prescient. Origami Yoda predicts the date of a pop quiz, guesses who stole the classroom Shakespeare bust, and saves a classmate from popularity-crushing embarrassment with some well-timed advice. Dwight's classmate Tommy wonders how Yoda can be so smart when Dwight himself is so clueless.