^^ All of that, and...
I think for a lot of the freshmen I mentor, that "time management" is deceptively hard. Looking ahead to it, it sounds like all you should have to do is get a daily planner, then put all your homeworks and papers and exams and practices in there, right?
Sure, but that's the END of a process of: figuring out how much your homework on p-orbitals and s-orbitals is going to take; figuring out how to actually write a paper from soup to nuts (research to printout); remembering that you have to include time for doing laundry (plus folding and ironing and organizing at a SA); you gotta eat from time to time; and you get your schedule all done this week and BAM, your roommie gets really sick and you have to fill in for her to get your squadron's/company's board up; or that second-classman in charge of company/squadron PT decides to add T/R early morning workouts.
I frequently have to remember that many of my freshmen come from families where much of their time was scheduled for them, and where the homework burden was significantly lighter than it is in college. They really, truly have no idea how much time to allocate to homework because they've never had to do much of it. They're shocked when I tell them to plan on 25-30 hours per week of homework. Add to that, many of them have no idea how to sit their butts down and work for an hour or two at something until it is done. (This is not a character flaw; it's a habit that's built from experience, just like weight-training.) Many overestimate how "smart" they are and think that the shiny, glinting, razor-sharp edge of their intellect will slay any subject like the weak dragon it is (because it's worked before!). MOST very bright young people greatly overestimate their abilities and under-estimate the effort required to learn. (Not mocking them, just observing.) Many haven't done their own laundry or folded clothes or ironed. Many have never once written a real research paper. Many have no idea how much time to allocate for studying for a test, or how to study effectively. And you can't master this stuff until you do it for yourself - and often, fail spectacularly at it, the first few times. At the SAs and SMCs, this burden is even heavier because there are extra obligations, and there just isn't a lot of flexibility built into a plebe's/swab's/doolie's schedule. Adding to this: most adults are very good at handling their lives and getting stuff done. Many of us forget how really very hard it is to learn and practice this, and how some of the lessons we learned ourselves, were very hard-earned and hard-won.
These are just some of the reasons why most college freshmen struggle at least a bit their first year, and some struggle mightily throughout. Even knowing all this, there is no teacher but experience.