what can i do if I miss the grades?

hey guys i know no one wants to think about this and i am SUCH a pessimist and major overthinker but i am genuinely worried for my grades since chemistry unit 3 went diabolical. i tried so so hard and i thought it would be my easiest exam but it was full of maths and for a girl who knows her content but doesnt do maths it was the definition of hell. anyways rant over i need aaa for med school (manchester). what would you recommend if i miss the grades e.g aab.

i know i can take a gap year and resit but where i live there are no opportunities for me to work as in its the most dead town ever and i dont have any connections around the uk to live somewhere else. i also feel like if I get out of the flow of studying, i will struggle getting back into it. the other option is doing a biomed transfer course now the issue is i am struggling to find unis that explain transfer courses on their websites. various sites like med portal explain there are feeder courses but i cant actually find it on the unis website. would you recommend doing a transfer course and where, calling up unis incase their in clearing, gap year...? pls help! (and if you could motivate me for my chemistry it would be much appreciated ahaha)