General advice for A-level students wanting to pursue quantum physics
Look at the subjects required by a university that offers Quantum Physics and that you'd like to attend. Study the subjects they require.

You'll perhaps be surprised that universities don't require all the subjects you've listed. These subjects are nonetheless useful, they just aren't absolutely necessary, moreover, universities know that students have limited study time. Important aspects of subjects that you don't study will be covered at university. (Furthermore, you can study any aspects that you consider important, but aren't covered.)