When you force high school kids to work days that are significantly longer than a normal adult to achieve a good GPA and get into a good college, you can expect that they are going to throttle back once they're away from home with way more free time than is normal. From my kid's experience: she was up at 6:30am, in AP classes by 7:30am (three more to go during the day). Classes were done by 3:00, then sports practice…
Still baffles me why is that even a thing that's considered at the colleges. I thought it was just a relic of Soviet past but no, apparently it exists in the US and other first world countries as well for some strange reason.