The 3 big things I'd say (that should apply no matter where you go) are:
1. Take everything everyone says about how to study with a grain of salt. There is no one study method, resource, or routine that is best for everyone or horrible for everyone. Find what works for you and do what you have to do to succeed. I had essentially everyone tell me from the beginning that making my own flash cards would take too much of my time and I'd never get out of them the work I'd have to put it. I listened, despite flash cards getting me through content intensive courses before, then bombed my first exam. I switched to making my own cards again, which yes took a lot of time, but ended up being my saving grace. Once I started doing that, my test averages jumped way up and even my advisor was more or less speechless at my improvement using an approach that most fail miserably with. Classmates still tell me I'm crazy. But it works for me when everything else I tried didn't, so that's what I do.
2. Make sure you are actively learning when you study and not just passively reviewing; study smarter not longer. It's easy to think watching a lecture recording twice, doing an outline of the slides, and then reading your outline means you did multiple passes. Reading through material 2-4 times does NOT mean you absorbed, memorized, and understood the material; it just means you saw it 2-4 times. I learned that the hard way. If you can't explain a concept/process/disease completely or reasonably close to completely without any help, then you didn't learn it. I didn't even realize I was only skimming material until I took my first exam and five minutes in I was in a panic thinking, "oh ****...I don't know enough...I don't feel even somewhat confident about over half of these questions." My productivity easily tripled and life became way less stressful when I started making sure I was actively paying attention to what I was studying, and called it quits or took a solid break when I couldn't resist lapsing into passive reading mode.
3. Don't sacrifice sleep for studying and take breaks when you start to hit the wall. Self explanatory. You'll regret it if you do it, I promise. It's basic physiology, your brain needs time to process and store new info and that time is when you step away for a break and when you sleep. If you feel like you don't have enough time to get everything done and get 7-8 hours of shut-eye, then your study routine is inefficient/flawed and that's what needs to change, not the pre-programmed time asleep your DNA says you need to function optimally and stay healthy.
Good luck. Don't be afraid to have fun. You're living the dream a lot of people would kill for, just know that once in a while it will probably seem like a nightmare—you just gotta keep your head up and tell yourself it will be ok until it becomes ok, which it always does.
