Hi there!
Its great to see your interest for pharmacy and hopefully I'll be able to answer some queries.
For me personally, I did biology, chemistry and maths. For some of my other peers at Bath, they didn't chose to do maths.
The important thing to understand within the pharmacy profession, numbers are involved and calculation are involved as well. Hence here at Bath every year we are examined through a calculation exam each academic year and we must pass in order to progress to the next year. It is important to note there is a calculation aspect in the pre-registration exam after the foundation year. So a level maths can be helpful to contextualise so definitely pick an A-level that you will enjoy studying. Here at Bath, we have support for those who didn't study maths at A-level and have student support if we require any help as well.
I hope this help and all the best in your decision.
University of Bath