Ok, I have a radical solution that you may not like, but it just might work: why not do both chem and physics at the beginning? (If I understood correctly, you’ll have 5 subjects next year if you did both.) If you have the feeling at the start of Unit 3 that the workload’s going to be too much and/or Chem isn’t going to get you anywhere, drop Chem (especially since you’ve seemed to have chosen a future pathway already that doesn’t require chem).
As for your future pathways, you’ll be given a list of preferences to fill with options. You could easily make the top one the Bachelor of Physics (or Bachelor of Science, majoring in physics) and either transfer or use the postgrad pathways to do medical imaging if you want to go that route later (but research whether this is possible first, as I’m not sure what the postgrad pathways require for entry). The second preference could be the bachelor of medical imaging. You have a total of 8 preferences and you won’t have to necessarily pick one or the other that way. (But you can figure out closer to the date, which is typically this time next year, which you’d want as your first preference as THAT will be important.)
If you later decide on a chem-requiring course, you could use a non-direct pathway or do bridging courses (where possible) if you later ditch chem.
Hope that helps.
