I have been trying to figure out the same thing. Apparently the results of the VCE compare almost identically with the UAI. So, looking at the VTAC book law in Melbourne is about 99.3 if i remember correctly. Thats the same as the Sydney Uni's..
ANU is lower apparently because there is less demand there, but I heard it has a strong law faculty...
This info is very vague and probably of no use..just what I have found so far...