I went to Australia to study in April, and then I stopped studying and went to work directly. Will I be arrested? Is it tight?

It's better not to do this. If international students don't enroll, their visas will be cancelled. The police will come to the door and send them to the detention center for repatriation. Returning to China will also be fined. Not only is the country's reputation humiliated, but it will also have a negative impact on your future travel abroad. For the sake of China compatriots, please don't do this.