I'm doing my maths, biology and psychology alevels right now and I applied for law but after I sent off my application I changed my mind and decided to take a gap year and apply for dentistry. I dont think im going to get good enough results for my maths A-level and I was wondering if I could do chemistry alevel in my gap year to make up for it? Will it be counted as retaking and will my bad grade in maths still affect my application a lot?