Most Colleges all over the Australia require a minimum of 12 years of formal education. In the Indian context, it implies qualifying in class 12th examination or junior college, as applicable or even diploma holders.
Graduate Programs (MS, MA, MBA etc)
Almost all Australian universities requires a bachelors program for admission in any post graduate program typically an Indian undergraduate studies is for 15 years. Australian universities do accept 15years of education where 16yrs undergraduate studies is a mandatory requirement.