Your options are fine as they are. All medicine requires is A2 Chemistry + Another Science subject at A2 (Biology, Physics or Maths) And you definitely have that and more. Religious Studies will also show university that you are a well rounded student and you have other interests other than medicine such as philosophy and peoples beliefs, shown by your A-Level in Religious Studies. Furthermore it shows that you enjoy reading, can write extended essays and understand how people feel about different situations and what they believe in, which is vital to know for medicine and psychiatry.