What will the school do if international students stop attending school but work all the time?

Will not be hacked. It's just a question of staying in Australia after the visa expires. Generally, you go out on a study visa. When you renew your visa there, you must always ask the school to show your school certificate and school results, otherwise the Immigration Bureau will definitely not give you a visa at will. If you don't have a visa, you will stay illegally in the local area and be sent back to China.