Sounds like when you teach a class, you are doing so in a way that suits girls better than it suits boys. It also sounds as though you don't understand why. As

Sounds like when you teach a class, you are doing so in a way that suits girls better than it suits boys. It also sounds as though you don't understand why. As you say, smaller classes would probably help, however what would also help is to actually try to understand why your teaching methods are less suited to boys than to girls.