There's a boy in the girls' bathroom - Louis Sachar

The wonderfully funny and richly warm novel by the bestselling, award-winning author of HolesMeet Bradley Chalkers. He's the oldest child in the class. He tells ENORMOUS lies. He picks fights with girls. The teachers say he has 'serious behaviour problems'. And no one likes him ... Except Carla, the new school counsellor. She thinks Bradley is kind and generous, and she even enjoys his far-fetched stories.
Carla knows that Bradley could change, if only he weren't afraid to try. Sometimes the hardest thing in the world is believing in yourself.
A heartwarming story of bravery and acceptance from Louis Sachar, the bestselling author of Holes and Fuzzy Mud.