I took AP English in High School and passed the AP Exam but I have no idea how. I always miss the symbolism and metaphors in books unless they are really, really obvious. For example, I read the Narnia Chronicles as a kid and had no idea that they were religious in nature. Heck, re-reading them as an adult I tended to miss the symbolism. So I miss most of what is in Card's novels.
Then again, I fully understood what wash happening in the Golden Compass.