I doubt that you can point to a high school which banned calculus. My guess is that you are referring to a political fight in San Francisco where a very specific racial/ethnic cohort of parents believes that one of the high schools is a Berkeley/Stanford acceptance funnel reserved for them, and they got mad when the government decided to spread the wealth.

From my perspective, there has never been any dumber debate than whether 9th grade math is called "Math" or "Algebra". My kids went to high school in Berkeley where Math is just called Math in grades 9-11 and after that you can take AP Calculus or AP Statistics if you want. And this is not Woke 1.0 stuff because the courses have been named that way forever.

They planned to do it state wide. The ban was blocked. It did not happen.

However, you can read the proposal if you want to see what sort of reasoning leads to "UC is admitting students to STEM majors, then finding out the students are not prepared for pre-algebra".