@Ninamonicaaa
Before coming over to Au to study, make sure that your nominated occupation is in SOL/CSOL; that after finishing your studies, it will lead to a Permanent Resident Pathway.
Check the occupational ceiling for your nominated occupation. Estimate if you'll reach the required points specific for your nominated occupation. Note, that some occupations require you to have 70points in order to be invited. It definitely is a risk especially that sudden and drastic changes to immigration policies were introduced just recently.