Graph theory? Do you mean like:
http://en.wikipedia.org/wiki/Graph_theory or do you mean how to graph things? Also, are you sure graphing isn't taught in high school? And number theory... well it's nothing you specifically do later on, number theory is scattered through your math classes. This is just what integers are, complex numbers, different kinds of permutations, arithmetic. You deal with number theory most of grade school, but only a little bit is covered within the whole field. A more useful thing to learn would by analysis, calculus or differential equations.
Personally I'd like to do more analysis, since that is of my weaker points, but I don't know if anyone's gonna volunteer to suddenly teach anything unless there is a person (or a group of people) that are already trying to do this in self study, in which case the student(s) would be more dedicated and the volunteer not wasting their time.
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