Must go back to school. According to official website, the Education Bureau, the signing of the senior high school entrance examination volunteers must be done in person, because it is an important measure to verify the authenticity of volunteers, avoid illegal agency and protect students' rights and interests. Tianjin is one of the four municipalities directly under the Central Government of China and the largest open city and industrial and commercial city in northern China. Tianjin is referred to as "Tianjin" for short, which means the ferry that the son of heaven passes through, also known as "Jingu" and "Jinmen".