Next best thing to becoming a doctor? (UK)?

Hiya,

I haven't actually got any grades yet i'm going back to school this September as i had to leave school at 15 and tutor myself at home to be a carer to my mum who was ill. This meant, though i did get support from my tutors at school who sent my work i didn't get the best grades. A for English then C and above for my others. Since then i've decided i would love to be a doctor so am re-taking my G.C.S.E's. I know how hard it is so i wanted a back up in case things don't go to plan.

I was thinking about either a paramedic or a nurse and was wondering what the entry requirements were for those in the UK and any other info you could give me would be great

Thanks.