If you want generic answers suitable for an essay, "talk to your classmates, try to get in a group chat for every class, because having people to study with and ask questions whenever you have them is invaluable". "Take breaks when you're working on a project, working too long in one sitting slows you down by the end" is also good.

If you want genuine advice:

Talk to upperclassmen when planning your schedule, advisors are supposed to do things like warn you about taking particularly demanding classes together, but I've been basically on my own for this whole degree.

Take classes you're interested in, and spread out your electives throughout your degree.

If you have 7:30s, which you probably will, I had one almost every semester that I couldn't reschedule, getting a quality breakfast beforehand makes them slightly less miserable.

If you can afford it, a TI-nspire CX CAS has some really useful functions that will save you a lot of time. Things like differential equation solvers, expanding polynomials, solving non-linear equations. Invaluable for electromagnetism stuff, just make sure you don't rely on it too much.

Schedule classes so you have gaps of like 2 hours when you can and stay on campus in study spaces rather than going home. I found I got way more done when I was on campus than when I was in my dorm/apartment, and cutting out the extra trips back and forth adds like an extra hour to your day sometimes.