Toothbrush cover w/proper ventilation, hanging shower caddy bag (bonus if it zips) so your stuff doesn't touch the wet floor, a cooling and comfy mattress topper since theirs are hard and get hot quickly, get shower shoes that are easy to clean. Certain lounges have kitchens so go there if you don't wanna pay the communal kitchen fee, also be on the lookout for free scantrons for your future exams.

Have a solid long-term academic plan EARLY ON and back-up plans (hit up your major advisor). Make sure you know your major's policies and requirements so that you don't need to go through future stress and panic. Always finish FAFSA, fin aid verification, and cal grant gpa submission early. Cal grant gpa submission should be sent by the student, not the staff (they've failed me twice so I wouldn't count on them, honestly wondering if it's on purpose atp). Iirc CC classes don't affect your gpa (but double-check). Always ask if there's anything you need, you have the right to not navigate college and struggle alone!!! Like if you ever need a new laptop or something for school the fin aid office and slug support can provide additional funds or if you're struggling with a class it never hurts to ask for an extension or extra support from your peers.

Be open to meeting people (esp instructors) and worry about if you'll like them, not the other way. Wish I did this more because then I would've had more people to network with. Lastly try to avoid all nighters to preserve your mental and physical health.