Oh No, It's Robert — Barbara Seuling

"""Robert has never won any awards or medals -- unlike his older brother Charlie. So when Mrs. Bernthal holds a contest in her classroom and the winner gets to keep a beautiful golden treasure chest for being a model student, Robert goes all out. Will his becoming a helper for other classrooms in the school do the trick? Or his Inventions Day report on the toilet bowl? Or his expert sleuthing that uncovers the mysterious book scribbler? Are his efforts even worth it since he's competing against little-miss-perfect Susanne Lee?"""