As of 2015, the Australian Government requires all students to have a USI which is a unique number that will allow you to track your studies with various educational providers (both TAFE and private providers) nationwide.
Please click on the link below to apply for a USI:https://www.usi.gov.au/students/get-a-usi
Please double check that the spelling of the name for your USI matches the name you have given on the enrolment