This is a fundamental difference between American schools and, let’s say, English schools. In most of Europe Math is a lesson that covers it all: geometry, algebra, statistics, etc. They also call it Maths, just to be different. You learn about everything with one teacher in one class.
Whereas, you’ll be aware that over here in America, we have trigonometry class, algebra class, calculus class, etc. I still think we have the best system, how overwhelming would it be to learn it all together?