The Australian Government has replaced the Genuine Temporary Entrant (GTE) requirement for student visas with a Genuine Student (GS) requirement. As per this mandatory requirement, all applicants for a student visa must be a genuine applicant for entry. Accordingly, you must stay as a student and be able to show an understanding that studying in Australia is the primary reason for your student visa. 

The GS requirement is intended to include students who, after studying in Australia, develop skills Australia needs and then apply for permanent residence. Therefore, to be granted a student visa, you must demonstrate that you satisfy the genuine student criterion.

Please search the link below for further information regarding the Genuine Student requirement. https://immi.homeaffairs.gov.au/visas/getting-a-visa/visa-listing/student-500/genuine-student-requirement