I want to do medicine. I chose Maths, Biology, Chemistry. But for my last option I chose Psychology. This is because I was told that I need to show a range of skills. As I have already chosen science subjects it shows I know the science. So by choosing psychology I extended my range. So I will be a better doctor and Uni's favour variety in medicine.
In your case I suggest French. I will not suggest further maths as you will eventually rip your hair out. Physics is not necessary for a degree in pharmacology/Chemistry so it will be mutually insignificant. French will enable you to possibly work in France. Also people who can speak more than 1 language fluently usually show extensive intelligence.