How selective is University of Melbourne's Graduate School of Science?

I am going to be graduating from Washington State University in one year, having finished in four years total, with a double major in Zoology and Music and so far my GPA is 3.45 but it is getting higher. I just had one bad semester that screwed my grades up with two Ds in organic chemistry and biometry. I have only been getting As and Bs in all of my other classes and only have two more science classes. The rest of my classes I need are mostly general education courses as I'm behind on that. I want to get my Master of Science in Zoology at Univ. of Melbourne. Biometry is required as part of the program so I'm not worried about my biometry grade since I just have to take it again anyway. How good are my chances and is it difficult to get into?