@hawkeye10,
I would say from reading this that the school system your kids attend is ordered differently than the schools in Massachusetts, or that your kids are in elementary school now which means you have no idea what high school curricula look like today.
There is no AP system.
Advanced placement classes are an additional layer of classes, reserved for seniors (and a few particularly bright juniors, some of whom then graduate after three years rather than four) that are taught at the college level.
Generally, in New England, vocational schools are separate from high schools. While today's vocation student may indeed be admitted to college, from my experience teaching (brief as it was) in a suburban Boston high school, sending a child to vocation schools approximates a prison sentence.
There is no general curriculum. Classes are tracked, perhaps more highly than when you were in school (I have assumed that you are in your 40s. Is that right?). In larger schools, the levels are College Prep I and II, with College Prep II taking the place of the general curriculum; followed by two more tiers above the CP levels, Advanced (generally reserved for freshmen classes and usually limited to English) and Honors (available in all departments, for grades 9 through 12).
In other words, students in CPII are more likely to have "ed plans," that is to be special needs students or kids with behavior problems. Frankly, all the teachers at the school where I worked hated the fact that many sweet kids who worked hard but simply weren't bright were subjected to classes filled with kids who were constant disruptions.
I moved 100 miles from Boston in the fall of 2007 and worked briefly as a substitute teacher in a rural system. After I appeared once, I was scheduled anywhere from three to five days a week, which was a financial boon. The rankings were not as marked and there were fewer layers in this small school than there were in the suburban high schools. However, the range from SPED to AP still existed, only on a smaller scale.