The situation that can be returned is 1. Due to school reasons, students cannot be guaranteed to enter school smoothly; 2. If you can't go to school on time due to personal and family accidents or deaths, you need to issue relevant medical certificates; 3. If the visa is refused, a letter of refusal is required; (However, the reason for rejection is that the foreign students' intention to study abroad is not true and needs to be considered individually. ) 4. If the academic qualifications or language requirements of the school offer are not met, you need to provide proof materials. If you can't come back, 1. Students will enter other schools; 2. Give up studying for work reasons; 3. Unable to provide unprovable materials to prove that it does not meet the requirements of the offer; 4. The visa was refused because of insufficient funds.