Oxford university requirements state 'It is highly recommended for candidates to have studied one or more science subjects (including Psychology) or Mathematics to A-level' so perhaps Psychology, another science (maybe biology) and then something you really enjoy. Remember you need a B in GCSE maths at most universities to study Psychology. (Not that I doubt you're good at maths)
Oxford university requirements state 'It is highly recommended for candidates to have studied one or more science subjects (including Psychology) or Mathematics to A-level' so perhaps Psychology, another science (maybe biology) and then something you really enjoy. Remember you need a B in GCSE maths at most universities to study Psychology. (Not that I doubt you're good at maths)