Nobody should be studying for (or in fact worrying about) the GAMSAT now. It is completely unnecessary and will be detrimental to your year/personality. I am of the opinion that if you've studied the base knowledge (and not failed it) then you only need standard exam preparation to do well. The majority of the questions are just testing your ability to apply what you read to the questions, not whether or not you know the amino acid sequence of collagen. Some are very hard, yes, but most aren't.
Yes, you can sit the UK version but it's by no means guaranteed to raise your marks. Some people have done worse after sitting it. It's not the end of the world if your GAMSAT mark isn't stellar, there are various other ways to compensate for it and hell, there are various other professions that you'll also enjoy.
If anyone has any specific GAMSAT questions I don't mind answering them, the essay section and section 1 are my favourites
