There is no single student-visa tax rate
Your tax residency determines which income-tax rules normally apply. A student visa does not by itself establish Australian tax residency, and immigration residency is a different concept. Check your circumstances using the ATO tests.
Combine all your jobs
Use annual gross wages and tax withheld across every employer. More than one job does not create a separate tax-free threshold for each job. The final assessment considers your combined income.
Tuition is not automatically deductible
A course must have the required connection to work you were already doing. Studying to enter a different profession generally does not qualify. A hospitality job does not make an unrelated nursing course deductible.
OSHC is not a Medicare exemption certificate
Overseas Student Health Cover is health insurance for international students. Holding it does not by itself prove an exemption from the Medicare levy. Check whether you need a Medicare Entitlement Statement and which days it covers. Do not select a full-year exemption just because you have a student visa.