I wish you the best of luck on your future endeavor. I admit I never quite managed to just pick up a textbook to read through ahead of time, though it would have (perhaps) helped.

I would give a few pieces of advise to my younger self, and I think they should still be valid for others:

First: it is very important to sleep, for a bunch of learning-related reasons. But, perhaps more measurable: if you feel the need to pull an all-nighter, it is very likely you are falling behind and trying to crunch your way through. I'm not saying don't do it, because if you are there, you are there, but maybe take the opportunity once it is all said and done to see if you can avoid it in the future, yeah? Sleeping enough is cool, and helps you learn better.

Second: understanding the fundamentals really helps you understand everything else. I struggled with some of the mathematics classes in my course exactly because I did not have a solid grasp of the fundamentals.

Third: you're going to be in class anyway, so pay attention (not that I didn't) and then, afterwards, review the class. Probably by writing a summary/notes about it. The point isn't to produce something that I can then look up, but to see what I retained and what I didn't, and thus I should review.

Fourth: put it into practice. Try to teach others (even if it is just a video you're never going to upload to youtube), or work through a project that exercises it. Theory is great. Toy exercises are great too. The best thing my university did for us was to get us 2 weeks worth of project at the end of each semester.

Fifth: the better you are at language, the better you will be at everything. Why? Simple: your classes will use language to transmit the knowledge to you, whether spoken or written. You will use language to transmit your answers to whoever is grading you. You can have the most amazing teacher and the most amazing learning materials, know all the right tools and techniques... but if you cannot really parse and understand what you are hearing/reading, then you won't learn. Likewise, you may know the material perfectly, but if you cannot articulate your answer? Not only will you not get good grades (which sucks), you will later on struggle to work with others as they, too, need to understand what is going on.

There are plenty of tools to help with all of the above. Index cards are great, whether physical or digital. But I would try to avoid falling into the pitfall that highlighting/underlining or writing notes is learning. They can definitely be tools for learning, but I have seen people who were prolific highlighters and note takers who did not have such a great domain over what they were supposedly learning.