Firstly, we're in Wales, & still have the AS / A2 system, & it remains common to at least start with 4 subjects. College will definitely be happy for dd to do this.
DD is trying to figure out whether to take Physics / Chemistry / Maths / Further maths, or whether to go for Physics / Chem / Biology / Maths.
At the moment, she thinks it most likely that she'll want to study physics at uni, but until recently she was very undecided between physics and biology/life sciences. Obviously the 3 sciences choice keeps that option open. So the question is, how important is further maths if you want to study physics? (She's very much a straight A* student in science/maths subjects, and I imagine will be looking at Cambridge natsci / Imperial / Warwick sort of level as an aspirational choice at least.)