This is the easiest way. College students have no jobs and no fixed sources of income. If you don't have enough money, it is also a safe way to ask your parents for it.
Do a part-time job
A certain number of work-study jobs will be set up in universities. The job content is to help teachers deal with some documents, or to work part-time in their spare time in exchange for their own labor.
3.AA system
Two people go out to eat, go shopping and go to the movies together, and each pays half the expenses.
save (on) expenditures
Save a part of the living expenses every month, and ask him/her out to play when the money has accumulated to a certain extent.