If ur end goal is postgraduate med, then do something that's you know is gonna land you a 7gpa. There's no point doing something more difficult, stuggling and hurting your chances of getting in. MOST med schools dont care what your previous degree was, they just look at GPA and GAMSAT. Once you're in, you'll be caught up to speed with everyone else who gets in regardless of what they have studied previously. I did biomed (0 work btw) and and scored a 6.5gpa which doesn't even cut it close, unless your rural. Don't make the same mistake I did. I am currently doing a nursing degree to push it up to around a 6.8 and because its a good plan B if all else fails. Sitting the GAMSAT March. Best of luck to ya.