A- level subject !!!Watch
Maths would be preferable but at the same time you only really need two of the science A levels to get into medicine or pharmacy. I have seen so many classmates get into medicine with biology, chemistry and psychology so it's not the end of the world. You're better off taking economics and getting AAA in your A levels than taking maths and getting BBC
That is a good combination, yes, but you may want to consider the likelihood of excelling in your sciences if you are struggling with your Maths. Whilst the Maths in A-Level Chemistry (and possibly biology, I don't take it) isn't conceptually difficult, there are a lot of calculations to do that are approximately GCSE-level.