Hey!! You don't need either physics or methods to get into most (if not all) medicine courses.
People take methods or physics to get into a Bachelor of Biomed or Science course, which they can then use a pathway to get into med. However, there are some courses (e.g. science at Monash) that don't need physics or methods to gain entry into. Biomed at Monash for instance needs methods, spesh OR physics.
For what it's worth, if you're finding methods super challenging, it might be better to do physics instead. That way you can maximise your study scores and spend more time on your other subjects instead of spending heaps of time on methods. Personally, I dropped out of methods after Year 11 because I found it difficult to learn it essentially teaching myself through covid.
Note that you can also take the equivalent of methods in uni, should you need it. E.g. do a bachelor of arts and do the methods equivalent in your first semester --> transfer to degree with methods pre-req.
I think something that could help if you stay in methods is to do heaps of practice papers, and ask your teacher for help when you don't understand a concept. Go through your SACs and past papers and really figure out why you're losing marks on questions. If your teacher doesn't explain concepts in a way that makes sense, ask another teacher. Tutoring could also be an option if that's viable for you.
Good luck 🙂