What preparations do college students need to make to apply for studying abroad?

It depends on the country you plan to go to.

If it is an application, it is basically

Passport, educational background, high school diploma (educational background certificate), TOEFL/IELTS scores (according to the requirements of different countries), at least 300,000 family assets need to be frozen in the bank for at least 3 months (the difference in the amount is calculated according to the tuition fees of the countries and foreign schools where you go, and the unfreezing time is when you get the visa), and you need to have a family member's work certificate and a description of the relationship (household registration book).

If it has been approved, it is necessary to prepare for going abroad:

It's best to bring all the necessities of life. After all, foreign things are still more expensive than domestic ones, not 1.2. But if the conditions at home are really good, you can relax. It is best to bring formal clothes (boys are suits, girls are more formal shirts, skirts, evening dresses and so on). There should be nothing else.