Direct conversion of a visitor or tourist visa to a student or work visa in Australia is generally not allowed. Applicants are usually required to apply for student or work visas from outside Australia. For student visas, having a Confirmation of Enrolment from an Australian educational institution and meeting Genuine Temporary Entrant criteria are necessary. For work visas, securing employer sponsorship and meeting skill and salary requirements are key. Working on a visitor visa is prohibited and can lead to visa cancellation, deportation, and future visa application difficulties. It is strongly recommended to consult a registered migration agent or immigration lawyer to navigate the specific eligibility and legal requirements. The safest approach is to apply for the appropriate visa while outside Australia or under allowed circumstances onshore with proper authorization