[stanford_labrat]

My public high school in WA also had this. "AP Calculus" covered Calc I and II, and once you had completed that there was a special elective called "Advanced Calculus" that covered Calc III (and prepared you for the AP Calc BC exam). In my graduating class about 30/430 ended up in this Advanced Calculus class senior year having finished AP Calculus as juniors, but many more who completed "regular" AP Calculus as seniors also ended up in STEM fields.

I took Advanced Calc and AP Stats senior year, which in retrospect was a mistake :P