hi,
Do you mean GPA from your poly results? actually SIM RMIT do not really see your GPA. they will determine it based on the school and subject you took during your poly days. Example if you took Marketing diploma from a local polytechnic, then you will have some modules exempted. So if the full modules is about 24 subjects, you will be exempted about 8 modules. so you need to take 16 modules.
hope this help.
cheers