I wanted to do medicine at first, but changed my mind, and now want to study Chemistry, and thought I would have to have grade 9s in all my GCSES and have lots of extra stuff to do Medicine. So I ended up studying chemistry, biology, economics and core maths at a level, core maths was only one year. This put so much burden on me that I ended up doing really badly in core maths achieved a D. Now my chemistry in second year is good, I love the maths and may achieve an A* but i made quite dumb decisions, not only was my core maths grade bad but also because i got a 6 in my GCSE I ended up resitting my maths GCSE in hope of bumping up my grade which i feel like was so unnecessary because i later on found out i could get into medicine with grade 6 in maths, but anyways i ended up resitting and got a 5, my grade went down. Now let's say even if I get an A* in chem and As in my economics and bio, would it not look really bad on my application and decrease my chance of acceptance?? The universities I'm applying to are St Andrews, Newcastle, Bristol, King's College and Southampton.