Placement examination refers to the internal examination conducted by the school after students enter school or at the end of the semester, which is divided into ordinary classes, fast classes and slow classes, English classes and math classes according to their grades or specialties. Exams are mostly conducted in the first day of junior high school or freshman year, and there are two kinds of voluntary participation and compulsory participation. Among them, the placement test in junior high school, that is, the placement test in junior high school, is more common.