Fun!
w00t I got an A+. *laugh* This was actually quite entertaining, I loved some of the answer choices. Please don't put the words on such bright backgrounds, it's hard to read in some sections.
Some simple sounds would also be nice, if you don't want to put in music, perhaps you could put in a sound effect when a user choose an answer, or something...still, not having sound does not really take away much.
By the way...
On one of the tests (Grammar, I think), you spelled "Their" "Thier" and HTML stands for Hypertext Markup Language. If you update it, maybe you can fix that. ^_^