That's a sure thing on Maths.
I'm 17, in AP Java, taking AP Calculus BC. Calculus is my hardest class, though I haven't gotten less than a perfect score in Computer since Midterm (we have trimesters).
Thankfully, my Computer teacher, while experienced in things that are now mostly useless (I think he's handy with Fortran and VERY elementary C) is very understanding and has suggested that I do classwork and then get on with whatever I like, as he admits he couldn't pass the Java AB exam (though he thinks I might, if I get on studying for it). At the moment I'm trying to hash out a Pong applet after doing in one 45 minute period what the other (bright) students take four or five days to do, and mine is the only code that doesn't look like alphabet soup.
The IT head is a mysterious, withdrawn fellow, but when I can occasionally speak with him we have much in common - he's actually installed Ubuntu on an old system and he's replacing a box in the layout room for the school paper; as I'm the head (and essentially sole) layout guy ("Publishing Editor") for the paper, I'm going to ask him to let me set up some Linux distro so I can use Scribus. However, this head IT fellow is really the only person in the computer department familiar with Linux, so it doesn't look like it'll spread.
Anyway, do pursue your studies as best you can - the importance of math is something I hear everywhere. And make sure that, as much as you study comp. Sci, you have something else if you're interested in Game Programming - diversification makes you more interesting.
I think disturbing knowledge of the history of fonts and being "Publishing Editor" of the school paper (with published articles on Dragon*Con and the Revolution, no less - GP2X soon to come in all likeliness) will do as much for me in college apps as all my computer instruction (probably more), simply because it's much more difficult to distinguish yourself in the usual academic framework.
Pardon the questionable relevancy factor, I'm tuned into Computer work after making a quick twenty helping my mother's friend with stupid web hosts and printer setup.
Hm, yes, that's a pithy statement.
"Help contacts with computer set-up and troubleshooting and they will throw money at you." This works best if you are roughly high-school age, I think. And terribly patient.