There's a boy in the girls' bathroom

This book is kind of a funny but sad at the same time. The main character is a boy which is a bully and never do his homework or study and that makes him stay back a year so he is the oldest in the year, but the stupidest. He is the kind of person which always lies to his mum and say that he is the best in class and he always got an A in class but his mum is about to find out the truth...

I actually like this book a lot because i know how he feels to be always left out and i really wants him to make friends.