I'm a bit weirded out by you kids taking 10+ AP tests. At that point it feels like you're cheapening college.
I took five: Macro, Micro, Calc BC, French Language and English. I grabbed a study book for the last one and took it on a whim. I have 5's on all of them.
I agree to an extent if they are using it to minimize course loads or really aren't qualified despite a passing grade, but wouldn't most just use it to replace nonsense easy A intro classes withmore intellectually stimulating classes that don't inflate GPA's and waste your time with basic material. My school didn't offer Calc BC and wouldn't let me take micro/macro while my mother prohibited comp gov (as my brother was taking it). Throw in psych which I didn't take out of spite - there are 5 extremely basic tests that I wasted my time taking at the undergraduate level when I could have challenged myself with a diverse array of classes. If I took twice as many as I did, I'd be able to have studied a lot more if what I liked and perhaps even picked up an extra minor rather than having a GPA which really isn't that impressive when considering a lot of the required intro coursework.
Heck, I would've probably taken more than the 10 I wanted to in hindsight - probably 13-15.
I mean, I guess GPA may not be inflated too much, since there many of the A's in intros will still get A's in the upper levels, but it's a matter of it not meaning anything or learning anything special.
Oh, and to answer the question, I took Calc AB, Stat, Physics B, APUSH, and US Gov (independent study). 5's except my 4 on physics