I took pre-algebra in grade school, algebra and intermediate algebra in high school (and intermediate algebra eventually gets very complicated, BTW). And in college I took calculus. Which I found easy to understand, in its basic form. Like algebra was for me. But my cousin's daughter took calculus in grade school. Who does that? Is that the rule today or the exception?
It all depends on what type of Diploma they choose to get to have the opportunity to take those classes.. She probably went for the college prep Diploma.. I went for it and I graduated with 2.5 Science Credits towards college.
I hated calculus. That's when I gave up on math, senior year. Then like 20 years later I realized coding is basically calculus at some level (functions). So I sorta used it without realizing it.
Of all the math classes that I had in high school (and we weren't allowed to skip any of them), I found algebra to be the most relevant and useful. It's helped me with calculating medication doses, drip speeds for IVs, ratios and proportions and much much more.
As part of my major, I was required to take about 30 semester units of math. Trigonometry, Geometry, Calculus, Differential Equations, Boundary Values, and a couple other courses I can't recall. Deriving calculus equations can be VERY difficult. Simply using calculus equations directly from the textbooks or Shaum's outlines is straight forward. Example: derive from scratch the formula for finding the volume of a sphere. SHOW YOUR WORK!
I took algebra one and two, then took algebra two again in community college, because I knew they got it wrong, and I wanted to figure out how they got it wrong. Calculus was exciting, but more of just an intellectual exercise. Eventually, I figured out what's wrong with algebra, but the solution requires systems logics, that can incorporate the Monstrous Moonshine Conjecture. Basically, according to the math, its possible to prove infinity exists in the real world, but infinity and the finite must express particle-wave duality, and prove to form a self-organizing singularity, that requires a sense of humor academia doesn't have. So, I created the proof in my poetry, which is comparable to the work of Spinoza and Wittgenstein, combined. A humanity's professor once told me his department spent a long time going over all the data, and concluded the problem is, people are too stupid. So, I wrote my proof for AI, hippies, artists, and linguists to appreciate.