the competition these days for Medicine is such that , if you go with NO work experience at all your application won;t even get past the first hurdle.
OP first of all - if applying for Medicine you need to have work experience. Lots of it. there's no denying that im afraid , recommended amount is 6-8 weeks.
you need Chemistry at A-level , and ( if your not stupid ) take Biology aswell. the other 2 A-levels are your choice.
i dont think UCAS Points matter OP , ALL medical schools want ATLEAST AAA in your A-levels ( some want A*AA ) so your offer will be based on grades , not ucas points.