I’m really confused about the premise of this thread. I think personality traits tied to conscientiousness and level of motivation have a lot more to do with college grades than high school experience or stats. The students who stay on top of all their reading, show up to class regularly, and take advantage of resources like profs’ office hours are likely to do better than the students who prioritize their social life. There is probably some correlation between that sort of behavior in high school and in college, but the removal of parental supervision and prodding from the equation can make a pretty big difference.