All I really remember about the book is that it took place in a school, but the main characters in the school weren't in a normal class. They were either on a half floor(like Floor 5 1/2) or on a floor that the rest of the school didn't know existed. Their teacher was eccentric and fun. I don't remember any of the characters names. That's all I really got

Oh, and it's NOT The Magic School Bus. Just getting that out of the way now.