Cohabitation immigrants

You are from China, and the success rate of getting PR through cohabitation is very low. Moreover, after getting the PR, you must marry the principal applicant within 6 months, otherwise there is a risk of canceling the PR qualification. After two years of marriage, you have to divorce, or you will be investigated if you apply for a real lover again. And once you divorce and apply for a lover, the Immigration Department will carefully check the authenticity of your marriage.

Generally speaking, your method doesn't work.

You'd better find a way to apply and work after graduation. Stop pretending.