Things are only ever easy if you know the answer, although I know what that teacher is talking about. I'm doing GCSE Physics, and, a few months ago, was given an A2 revision guide by by teacher and asked to read it quickly. 1 hour later he have me a paper whihc I got 55% on, apparently a B on that module. He did that with most of the class to prove a point very similar to the one that Grey was making in the quoted arctical. A week later he gave us the same test again and I barely got a C, so mabey memory is the key.