it's like this: if you were in a super performant class where everyone read all the teacher's material supposedly until they knew it perfectly, then you would e

it's like this: if you were in a super performant class where everyone read all the teacher's material supposedly until they knew it perfectly, then you would expect that there would be no correlation between the number of times the public class into is read and performance, as you expect everyone to be really performant and read it enough times. You would expect that for such super performant students, the only relevant info would be what they get elsewhere, because that's less obvious than studying the class material, which everyone is expected to already know perfectly. Turns out maybe the students aren't actually that good at knowing if they read the material sufficiently well, and you can get information about who will do better at the test just by looking at who looked at the class material the most. The surprise is that the students are worse then we thought.