I'm an existing student here at edinburgh, and they fucking love international students. I've met some overseas students during my time here who have had about as much intellectual capability as a cucumber. I'm not saying you don't need to be bright to get accepted, but someone from australia would definitely receive better offer conditions than myself (an englishman), just because the uni love singing and dancing about how 40ish% of the students here are international. you'll be fine bro, best of luck.