Yes, it definitely is! If I could get here, it is definitely achievable for anyone who wants to do it!
Chemistry wasn’t my best subject at A-level either, but if you put lots of extra work into it, get confusing parts explained to you by your teacher you can pull through. Don’t lose hope because A-level Chemistry is difficult; once you start the medical course it’s all Biology and there isn’t a lot of Chemistry involved at all. If you need extra help with A-levels you might find reading my 3 Step A-level Revision Method helpful or may want to check out my A-level chemistry summary notes.
If you haven’t started your A-levels yet, it might be worth bearing in mind that a Chemistry A-level is not made a requirement by every medical school – you could choose another subject instead of Chemistry and ten filter where you apply.