Actually I don't know. But if you click on My Assistant at the top bar right side and click on Top 10 Posters, you could probably figure out the formula. If you do, let me know.

I don't really know if there is anything higher than 5th year. Maybe we have to pass our OWL's and then we become wand-carrying witches and wizards. It's worth hanging around to find out. The new book comes out July 16, 2005.