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Trying when possible to stay a week ahead on things - depending on your course this may be impossible but even if you can stay 2 days ahead it'll give you a little bit of breathing room and time incase something turns out to be harder than you thought.
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Find your spot, depending on how you work dead silence may be good for you or maybe somewhere with some noise. When you get to uni I'd recommend grabbing some friends and going exploring for some good study spots where you can feel focused.
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Try out some revision techniques now, maybe you want to learn a language or music theory or a programming language. You can use these interests to nail down how you best learn. Personally I'm a flashcards forever kind of person but maybe you like mindmaps or creating little songs with all the information in. Nothing is too dumb if it gets you to remember it
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My last tip would be when needing to start a project just start it. I find a lot of people sit staring at a blank page or empty questions and can't get past that. Just start writing, it may be horrendous, you'll probably delete some of it at the end but it gets a lot less intimidating to add things when there's something already there.