Hey there,
A week is still plenty of time! You can definitely make the most of it, and increase your exam score by more than a few marks. With that being said, don’t do overboard and grind endless papers. If you feel confident enough, I would even suggest doing only one or two exams at most. It is better to use this time to review your past mistakes instead, or even better, doing the difficult questions in the previous exams you come across. This is a light but efficient form of study, and can also be a confidence boost! You can really see how much you have improved, and rest assured that there are countless mistakes you have discovered which you won’t make again.
At this stage, confidence and mindset is key. Make sure to take plenty of breaks, eat and drink well, get sleep etc. It is more important to focus on making sure that you can perform to your optimal level on the day of the exam, rather than stressing about any obscure bits of maths that you're unlikely to encounter.
Hope this helps, and best of luck for the exam!
James