Get used to getting up late and eating badly.
You already have many technical tips, I will add a few completely different thoughts.
What I missed was an optional orientation week before the 1st semester, as I was a “backer”.Do this, even if it is optional, it lets you get in at the organizational level and you get to know first fellow students who are more involved than other students.
I studied physics and mathematics is a partial study, in the first semesters you learn in parallel with maths and geology students (as of the 1990s University of Hamburg).If you are involved with non-students, your paths sooner or later will be forcibly separated, even if there is an overarching interest in mathematics or vice versa physics/geology, you already have enough to do with your studies.
At first, however, you don’t need to worry too much about being equipped with too little prior knowledge.The first semesters mostly contain lectures, which repeats A-level school mathematics in a quick run, in order to bring all students together. Possibly. If you have fewer gaps than others, but that doesn’t depend solely on your own school performance, at least you can use this time well to settle into your studies and rehearse your independent learning. It is also not to be despised that one notices how a second run through a topic is good, deepens one’s knowledge and raises it to university level, more professional than school.
I got along very well at school with my ability to get things right quickly, which I often deliberately didn’t memorize to save myself the ballast.If you are also the type of student, then be prepared to have to learn a lot more timpani and memorization here, the material is much more extensive and exams can already query quite special things and especially oral exams do not leave you eternaltime time for such solutions. However, it is not bad, one is no longer burdened with all sorts of other fields at the same time and learns here after all for his career, since more sustainable knowledge on demand without having to look up in later work everyday life makes sense anyway, the ubiquitous Internet as a means of work.
Self-learning is the fulcrum, even if you are required to give various lectures in order to make your notes and qualify you for exams and also, although in tutorials parallel to the lectures, to present homework and their solutions to the school learning.This characterizes the first semesters in particular with few possibilities of variation, but that will change later. Tutoria then also move into seminars that require more autonomy.
On the most positive side, you will certainly enjoy studying together with more professionally enthusiastic rather than frustrated ones, which alone makes every study more motivating than everyday school life, especially in science subjects.