Do the boring things early, because they compound
An afternoon of admin in the first fortnight buys back weeks of low grade stress later.
There is a short list of unexciting tasks that quietly determine how smooth your year feels. Getting your banking sorted. A phone and data plan you actually understand. Whatever transport card or concession applies where you are. Knowing where the nearest general practice is and having been once, so that you are not searching for a doctor for the first time on a day you feel terrible. Registering with the parts of your institution that exist to help you: the student support office, the accommodation people, the library staff, whoever handles the practical side. None of it is urgent on any given day, which is exactly why it drifts.
The reason to front load these is compounding. Each one is a small dependency, and unsorted dependencies fail at the worst moment: the payment that will not go through the night before a deadline, the appointment you cannot get in the week you need it, the letter that goes to your old address. Do one item a day for a week and the whole list is gone. Keep every reference number, every account name and every confirmation email in a single folder, physical or digital, and back it up somewhere. Future you, standing at a counter being asked for a number, will be grateful.
Two cautions. First, anything touching your right to be in the country, your enrolment conditions or your permission to work is not a topic for student advice, ours or a housemate's. Those questions belong with the responsible government body or a registered migration agent, and the correct move is always to ask them directly rather than to act on what somebody heard. Second, be sceptical of confident advice from other students about official processes generally. They mean well. They are also describing a version of the system from two years ago, in a different situation, with a different set of facts.