Working on the premise that you WILL be going to university.......
Apply for accommodation if you haven’t already OR check what you’ve got is what you really want. Do you need an ensuite? Shared bathrooms mean you have to leave your room even if it’s just to join the queue outside the loo door! Yes, they can be mucky but we'll have some cleaning tips to follow
You will probably already have a bank account but if not open one TODAY – you will need it for your student maintenance loan to be paid directly to you
Start a spreadsheet – a simple one will do – incomings (student loan and parental contribution) and approximate monthly outgoings: rent (£400), groceries (£110), going out (£60) plus utility bills, travel, books, etc