I done so bad on my AS :( i don't know what my options are...Watch
Repeating year 12 seems like a sensible option to me, but at a different educational institution. You say that the teachers don’t help you at your current school, so it would be beneficial to move to a different college / sixth form. You now have the experience of year 12 and doing AS exams, so you can reflect upon what went wrong and to change that, starting revision earlier. To do physics at university you need maths, it’s be foolish not to take it. There’s no rush to go to university; sit, breathe, and discuss your options with your family.
You could if worst comes to worst, but why have you failed a second time then? Did you not learn how to improve from the first time you did year 12? Perhaps an access scheme or just going into the world of work is more suited for you then. Academics and exams aren’t suited for everyone though.