Help! Understanding the O.W.L.s

[~Maitresse]

No: HPFGUIDX 102804

Bill and Percy both received twelve O.W.L.s, I assumed Hermione 
would be on par with Bill and Percy but as to my calculations she is 
only taking ten classes so how would you get twelve O.W.L.s from 
that? 

Did Bill and Percy take that many more classes? Why wouldn't 
Hermione take the max amount, although I do understand that the one 
O.W.L. would have been dropped for Divination. Though how anyone 
could get an O.W.L. in Divination, I don't know.

Any help would be appreciated. Thanks,

~Maitresse