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Under-18 International Student Visa holders

place for accommodation and welfare before the Department of Home Affairs will process your visa. ... Sign a contract with your preferred welfare and accommodation providers and pay them any necessary fees.
www.sydney.edu.au/study/applying/apply-for-a-visa/under-18-international-student-visa-holder.html
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Moving to Sydney

Finding accommodation. The University has a range of on-campus accommodation options but they often fill up quickly – make sure you apply for accommodation early. ... This means that you'll need to book short-term accommodation before you arrive.
www.sydney.edu.au/study/preparing-for-uni/moving-to-sydney.html
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Authorised agents

Education agents can also help you with the application process and some agents can assist with other practical arrangements including flights, visas and accommodation.
www.sydney.edu.au/study/applying/how-to-apply/international-students/global-agents.html
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E12 Early Offer and Scholarship Scheme

Receive a conditional offer before HSC results are released and benefit from a $5950 scholarship in your first year. Apply for the E12 Scheme.
www.sydney.edu.au/study/applying/admission-pathways/e12-early-offer-and-scholarship-scheme.html