Stop listening to the science pushers. Do Biology and Chemistry. And for the other what YOU want and are good at. At the end of the day universities only care if you can meet their offer,,,other than that there are so many other things to differentiate between candidates.
I'm currently a first year and did Biology, Chemistry and English Literature with Geography at AS- It honestly does not matter, if anything, for me doing maths would have hindered my chances because I would have had no motivation whatsoever to do it.