Why is there a junior high school in Huiwen Primary School in Cao Xian?

Nine-year compulsory education school. Huiwen Primary School in Cao Xian County is a nine-year compulsory school, including primary school and junior high school, for a total of nine years, so the school has junior high school. Cao County is a county under the jurisdiction of Heze City, Shandong Province, and one of the first 20 provincial-level counties in Shandong Province. Located in the southwest of Shandong Province, at the junction of eight counties in Shandong, Jiangsu, Henan and Anhui provinces, with an area of 1969 square kilometers.