I graduated high school in the USA in the past decade. I was never taught Calculus. I wasn't even very good at algebra. Eventually I went on to get a math mino

I graduated high school in the USA in the past decade. I was never taught Calculus. I wasn't even very good at algebra. Eventually I went on to get a math minor in college to go with my computer science degree, but I didn't even learn the first thing about Calculus until I was 21. Math and Science education in the USA is really really abyssal until college, and then it's sink or swim.