The order of the first-grade placement list is generally determined by random selection or computer generation. The purpose of this is to allocate students to all classes fairly and justly, and avoid prejudice or injustice. Random placement can ensure that every student has equal opportunities and rights, and at the same time, it can promote the diversity and communication between classes. This method is widely used in the process of school placement to ensure the fair distribution of educational resources and the all-round development of students.