I am just about to graduate from high school in the US, but I was born and raised in England until year 7. Over here, I did pre-algebra, then algebra, then geometry, then advanced algebra, then pre-calculus and then this year I took calculus. In the American system, its more of a step by step system, we couldn't move on to geometry unless we had passed the classes before it because they teach it so that you need the information from the year before for the next class. For example, in pre-calc last year, I learned trigonometry which I now need all the time in calc. Its just a different system, but they both work just fine in my opinion! Over here, calc is considered the top of the math pyramid, you have to learn everything else to be able to do it, which I pretty much agree with. Statistics is a whole different area over here.