Do a course that will give you a career afterwards, in the chance that you don't get into med. Pretty much all medical schools around the country that accept you after starting uni will take you with any course- as long as your uni marks are high that is all that matters! By doing med sci you are literally graduating with a degree with very limited job opportunities as well as making life hard for yourself because of it's highly competitive nature- you will struggle to get the uni marks required to be competitive.
So my advice would be to go into a course with a job at the end of the tunnel, you are not disadvantaging yourself by doing nursing, pharmacy, paramed, teaching, law or literally whatever you like! Although there are a limited few medical schools around the country that require a few science subject prereqs like monash grad entry, the spaces in this category are super low (25 I think? And you have to go to monash to get in?) you are better off thinking towards your future; backing yourself up so you do not end up with a degree you may struggle to use.