AP scores and SAT II's are highly subject to the quality of instruction. I had several teachers who treated it as a more advanced class than honors, but felt no need to teach to the rubric for the test specifically.

I aced the SAT and ACT but had a decent number of mediocre AP scores because I was seeing the material for the first time when I opened the test. Got to college and after a single 45 minute lecture covering the gap material, I'm pretty sure I could have scored a 5. Ended up making for several easy A's freshman year.