I wish I had looked at the greater scope of my studies and organised my time better so that I could prepare for some of my future subjects. I realise that trying to cramming in too much will lead to burn out, but I found that with each semester the level of material gets more challenging and the university establishment is harsh when it comes to pre-requisites for certain subjects which you are expected to know beforehand. Some of the pre-requisites will have fair expectations but those that don't are the ones to worry about. I feel like I could have had an easier time at university if I had drawn up an entire course plan instead of living and studying from semester to semester. For example, in my spare time during certain semester breaks I could've spent the time studying Differential Equations which was only briefly touched on in my course but we were expected to know it all for future subjects. So in summary, university can be unfair but often times you can avoid falling into the pits of despair by examining the entire course syllabus and understanding clearly what is done during the lectures and laboratories and what you need to do more of later in your free time. Easier said than done of course and this will certainly kill any socialisation, but I feel that I would easily trade any social time for the chance to be more well prepared and to top every class and exam.
Since you will be most likely having your first year online one thing I would really recommend would be to get as clear answers as possible on the organisation of the course, what is expected of students, when important exam dates are and whether any changes have been committed to the course. This requires you to ask your lecturers about these things frequently which I am sure they will be annoyed, but since you are paying for the course because you are studying in England you have every right to know everything that is going on and to be nosy. The problem I've had with my course is that during the lockdown lecturers were rather nonchalant about ensuring that all their students were informed about important materials and dates and if I had failed an assignment they wouldn't tell me about it unless I had asked them explicitly for the outcome, which meant that if I hadn't taken a proactive role I would've failed the subject and have had to retake it next year. I am sure that for English universities the regulations are much stricter and you have more to lose, because it is also a financial incentive for the university if you have to pay for retakes or retake the entire year. Lecturers will not always be the most reasonable people. I knew of someone who had failed a course even though it was the lecturer's fault for not informing him that he had not met one of the requirements for a subject. In these times many people are not always used to working online, and they may have unrealistic expectations of students at the same time. Remember to stay on top of things.