If you want to open a factory in the future, you have to go to school regardless of your salary. It doesn't mean that you can study for half a year or a year. It depends on whether you have the psychological quality and ability to open a factory. Otherwise, you must have paid the tuition with your sister's money. But also can learn a lot, such as some business management, marketing, business negotiation, cost calculation. And finance and things like that. . . You can ask people to do a lot of things, but you must understand, or you will be led by others.