The CET-4 score certificate is usually used for degree application, employment and study abroad. However, the validity period of the grade certificate can be changed according to different situations. Generally speaking, in employment, the certificate of achievement is valid for two years. In other words, you can apply for a job within two years with a four-level certificate. However, the validity period may vary depending on the company, industry or specific requirements. Therefore, it is best to consult relevant institutions or companies to obtain accurate information under specific circumstances. In addition, there may be different requirements for studying abroad or applying for a degree. You need to consult the regulations of relevant universities or institutions to determine the specific requirements of the validity period. In short, it is very important to know the specific situation and update your grade certificate in time.