http://sydney.edu.au/study/admissio...ents/undergraduate-academic-requirements.html
Applying with tertiary studies
To be eligible for admission into an undergraduate degree on the basis of tertiary studies, you need to have completed at least one year of full-time study (or the part-time equivalent) at a bachelor’s degree level or higher.
If you have not completed a full year, you will be assessed on your secondary results.
If you're applying for a course with additional selection criteria, such as an interview, audition or portfolio, these factors will also be taken into account.
The success of your application will be determined by the best result in a tertiary or secondary qualification, regardless of the order in which you completed them. This means that if your ATAR or other secondary result is higher than your tertiary result, your application will be considered on the ATAR/secondary result only.