Beijing junior high school entrance registration card was downloaded from official website, a compulsory education service platform in Beijing. Official website, the compulsory education service platform in Beijing, as the authoritative education service platform in Beijing, manages the information of all students' status in Beijing. As an important proof of school admission, the registration card needs to be properly kept by parents and students. The account number and password in this card are very important for students to use when filling out their volunteers and searching online.