Explaining to a classmate is also studying

Among the works of mercy is instructing the ignorant. It sounds solemn, but at exam time it takes a very concrete form: explaining to a classmate what you've understood and he can't get his head around. Sometimes you can't be bothered or it seems like a waste of time. And yet whoever explains something understands it better: they have to put it in order, look for simple words, answer questions they hadn't asked themselves. Helping someone else study is pure charity: it doesn't get noticed much, it doesn't earn extra points and it can change someone's year. And it teaches you to study thinking about others too, not just about your grade.