1. According to today's headline data, network problems: due to factors such as network instability or email system errors, resumes cannot be sent to the admissions party in time, or the admissions party cannot reply in time.
2. The school review process is complicated: some schools need to consider many aspects when reviewing the application materials, and have requirements for the applicant's education, background and grades. They are all very harsh, which leads to a long review time and cannot be notified in time.
3. Incomplete or unqualified application materials: Some schools have strict requirements for applicants' application materials when enrolling students. If the materials are incomplete or unqualified, they may be rejected. In this case, the applicant usually does not receive any notice.