Let me just say that not crashing and burning is difficult, even if you did well in previous schooling. (I speak from experience, having ended my first semester with a .76 GPA.) That being noted, the best possible things you can do to prevent that are:
have a planner and continually update that planner with every test, homework, or in-class assignment you get
study a week in advance minimum for every test you have
review your notes a little while after each class in small chunks (helps cement the information in your head)
Study groups in difficult classes are a lifesaver, so even if you feel a little awkward, try to put one together
If you don't understand something, don't feel bad about going to a professor's office hours to try to get another explanation. It's what the office hours are there for. Use them.
Don't put off your homework unless you truly don't know how to do it yet because that leads down a rabbit-hole of unfinished/late assignments that'll drag your grade down.
Make a cheat sheet for each of your tests. Yes, even if the prof doesn't allow cheat sheets to be used on the test itself, make one anyway. It's a good way to study and makes for easy review whenever you have a moment to sit down.
Don't skip meals. You may feel like you don't have time to go eat, which fair enough, you might not, but don't skip meals where at all possible, and especially not over an extended period. You'll get lethargic and start falling asleep in classes, not to mention being easily distractible and at risk for illness.
Get a good amount of sleep. Get a solid sleep routine and stick to it as best you can. Don't wildly swing between no sleep and 10 hours of sleep, that's just bad in general.
Know where your classes are before the first day. On move-in day, or just one random day before classes start, go find your classes. Find the buildings, plot a route. Print off a map of your campus if you can and trace it down. Just know where they are and know how to get there the fastest.
Get a routine. Beyond even sleep and eating, get a routine. Steady routines will allow you to plan times to study better than messy chaos days.
DON'T SKIP CLASSES E V E R
Alright I think that's the low-down on the biggest stuff. Good luck and have fun!