Ah, Actuarial. I'd do that but apparently it's supermaths and... I'm not exactly too keen on that. I'm open to it - for sure, but I like the idea of modelling or stats (because it sounds fun). Still, for Commerce - you'd probably be better off doing something like Finance to give you a Business backing so you can get mathsy jobs when you graduate. No point doing management because... that, to me, won't exactly help you get a mathsy job. My two cents, of course.
And for maths - apparently you can only take one. So... yeah. But we're all learning! Even me now. So just holla and perhaps we'll figure it out =P