| Hermione was only taking 9 classes her 5th year, yet in the 6th book it says she received 10 OWLs. It doesn't say in the books, but it is possible that Hermione sat the Muggle Studies OWL without taking the class, since she obviously knew the material. That's the only way she could have gotten 10 OWLs. The alternative could be that J.K. Rowling made a mistake--math isn't her strong suit. |