If I'm going on college Jeopardy, what are some good things to study?

I was on Jeopardy in June--I won twice. If you get on the show, you've already ped a couple of tests and will probably do fine on what you already know, BUT it never hurts to study things like state and world capitals, geography--and Canada. Alex is Canadian and there are often questions or categories about Canada. Make sure you know your Presidents, too.