I am reporting what I see in my district. My kid is attending one of the two high schools on the trimester system where you can only take 3 trimesters of math a year at most. Right now, my kid is planning two trimesters of math per year to AP Calc AB or Stats. The families who want extra acceleration can transfer to one of three schools on the quarter system. The typical family that seeks extra acceleration has engineer parents from elite overseas universities, their students are involved in science Olympiad, robotics, cyber security, math competition, etc. extracurricular activities.