From what grade did Tianjin primary school students practice volleyball?

Tianjin primary school students began to practice volleyball from grade one. Starting from the fall semester of 20021,Tianjin has made full use of after-school service time to offer extended physical education courses, which makes up for the shortage of physical education hours. Table tennis, volleyball, football, basketball, aerobics and track and field courses are offered in grades one to six. The ultimate goal is to enable every student to master one or more sports skills through six-year physical education courses, so Tianjin primary school students practice volleyball from grade one. Tianjin, referred to as Jingu and Jinmen for short, is the economic center of Bohai Rim approved by People's Republic of China (PRC), a provincial administrative region, a municipality directly under the Central Government, a national central city and a megacity, and approved by the State Council.