Hey so I actually hold an offer for physics at Oxford and I think that predicted grades can advantage you but they're unlikely to disadvantage you (unless they're below the entry requirements).
Physics admissions has a very clear procedure. After the PAT, you're given a score based on your PAT score and cGCSE (well at least pre-COVID, they didn't consider GCSEs this year). The top ~250 or so are automatically shortlisted for an interview. Then an extra ~150 or so are shortlisted based on "other evidence of excellence" and contextual data. This is when your predicted grades might come in so try and aim to be in the automatic shortlist. After your interview, you're also given a score and that's added up to your PAT grade and candidates are ranked and divided into three bands. Usually almost all band A candidates get in and some band B who have e.g. good predicted grades. So again, if you're already a band A candidate with an excellent interview score and PAT score, your grades are unlikely to hurt you.
If there's nothing you can change about your predicted grades, then focus on PAT and interview prep. It's great that you're learning about the uncertainty theorem! However, don't fall into the trap of spending all your time reading about super complicated material because a. you're unlikely to have the mathematical background to properly understand it b.you'll be taught the advanced stuff again at university anyways and c. it's incredibly unlikely to come up in your interview. Do of course read around for interest, you love the subject that's why you're studying it after all, but focus your prep for interviews and tests on sharpening your A level skills. Good luck!