Admission requirements can vary from program to program and university to university in Australia. The entry requirements for the same program can be different from university to university because of the fact that universities and colleges are autonomous institutions in Australia.
Certain programs such as Nursing may have higher IELTS requirements in Australia even at Bachelor degree level whereas Master degree programs may have lower entry requirements in different field of studies.
For most of the programs students can directly apply as consecutive bachelor or master degree study whereas some programs such as MBA may require additional work experience to be eligible for admission in the program.
Similarly, students whose bachelor degree is not considered as an equivalent to the Australian Bachelor degree may apply for credit transfer for a year or two at an Australian university leading to Master degree. Likewise, students who have low grades in Bachelor degree or have studied a 3-year Bachelor degree from Nepal may apply for a postgraduate qualifying program leading to Master degree.
The beauty of Australian education is no matter which level you want to study and despite your requirements there is always something for everyone. In summary, if you are interested in studying in Australia, there are different ways through which you can apply and having a deficit in one thing does not merely stop you to undertake your studies, however adding too many packaging courses might lead to visa refusals.