Interesting thing with the integrated approach is my high school had that approach. That was private school, and I entered high school in 1990. I wonder how l

Interesting thing with the integrated approach is my high school had that approach. That was private school, and I entered high school in 1990. I wonder how long European countries have been using this approach. The curriculum at my high school very deliberately blended all the mathematical subjects across the first 3 years with Calculus becoming dominant by the end of the 3rd year. However the entire goal of the integrated program was to maximize the amount of Calculus students could get through. I got not one year but two years of Calculus effectively by the end of HS and had no problem passing the AP calc exam. Probably only 10% of my HS class did that though, and that was already at a selective private school. Integrated is great as long it gets students to the same place.. it's still really important to get as many talented students into Calculus before HS graduation.