hi there johann,

you should have a three year Bachelor's Degree in any stream or an equivalent qualification according to australian ordinary Degree.apart from this almost all the Ausatralian Buisness institutions require a minimum of 2 years of work experience for your application to be eligible.

for A list schools like Melbourne Buisness School  you will require GMAT Score else it is not manditory.

for Indian Students IELTS score is required for getting a students visa in australia.