I've done well in classes I've briefed thoroughly, and done not-so-well in classes I've briefed thoroughly. I've done well in classes that I obsessively look up the citations mentioned in the notes, and not-so-well in such classes. (I'm having sentence structure problems, sorry.) And so forth. I have one of my best grades in a class where I learned the class in three nights--commercially--and for all intents and purposes never opened the casebook.
Law school exams aren't luck, but they're also not dependent on some process. You can learn the same *&^% a dozen different ways. Do whichever you hate least. I guess that's probably what Wally's getting at, so, yeah Walls, alright.