What do you learn in senior high?

I've been wondering lately, how much did you learn in years 11 and 12 that you still regularly use?

I figure, if you know what you're wanting to do beyond school, you should almost exclusively study all the things that would apply to that goal. In the senior years of high school you may cultivate passions for subjects (such as history or English), but the specifics that fill your mind are basically without everyday use (aside from the odd trivia night).

Sure, with math or science, you may use them in your profession, but when else? I'm pretty sure my three unit maths know-how hasn't been unitised since the last millennium.