Advanced highers for chemistry degree

A look at the University of Edinburgh and the University of Glasgow's entry requirements for their chemistry degrees shows that Higher Chemistry and Maths are needed and that if you take Advanced Highers that Chemistry and Maths are preferred (and needed if you'd like 2nd year entry).
Based on this, I would recommend taking Advanced Higher Maths since you have the option. Although I understand that the Foundation Apprenticeship would gain you relevant and useful experience in the field, it seems that having a good knowledge of maths is seen as extremely important to these universities.
I hope this helps, and if you have any more questions, feel free to ask me. 😊