Comparatively speaking, the entrance requirements of Melbourne University are not high, but those who are not very good at it have no choice but to transfer or be expelled. There are many such people around me. The difference between the University of Mexico and other Australian universities is that it is the most rigorous and the most difficult.
Many people like to measure the quality of a university by its entrance requirements. Every country has different national conditions, and China has a large population, so the competition among universities is fierce.
The population of Australia is only as large as that of Shanghai, so the competition is not so fierce and the admission requirements are not so high. Nevertheless, the University of Melbourne has produced four Nobel Prize winners. Of course, Nobel Prize winners are all professors and have little to do with students, although graduate students have to help professors do basic work.