This may get me flamed, but... I wonder if some of the seeming expansion of summer work for AP classes is due to the fact that more and more kids are taking the classes.
In the 90s, AP classes were typically restricted to just the top few percentage of students. Now it's not at all unusual to have a school where 50% of the kids take an AP class. If it's just the very, very top students taking the classes, the teachers are only dealing with students who are coming into the class very prepared - they have the background knowledge, basic information, and academic speed to quickly move through the material, even without having to do a lot of pre-work over the summer.
When half the school is taking a class, though, the teachers need to be sure that all of the students are actually prepared to hit the ground running, so they have to give review work to make sure they don't loose the needed skills and enhancement work to make sure the students know the basic background info that might be required for that class.
That's a fair point. When I was in HS in the mid-90s, the honors and AP program at my public school was very selective. You had to test in and it was not unusual for 150+ kids to take the test for a class that had 30 spots. I took a bunch of AP classes and I don't recall having summer work for any class other than AP English, but we did have a fair amount for that - reading about 8 books plus some related writing assignments.
By the time my sister got to the same HS four years later, they opened up honors and AP to anyone who wanted to take it...which of course resulted in dumbing down the classes and fewer kids actually capable of taking and passing the AP exams. I'll have to ask her whether they had summer work.
Personally, I took AP classes not because I wanted to get college credit but because they were the only classes that were actually challenging...the "college prep" classes at my well regarded HS were a joke, I don't think they prepared anyone for anything other than maybe junior college.
