Cai Zixing went to the Mass Center because he liked to study competitions and wanted to spread what he had learned to more people. Centroid education is a website dedicated to providing learning resources, policy information and other contents for high school subject competitions and independent enrollment. Cai Zixing, CCO, chief creative officer of Centroid Education, gold medal producer of APho, graduated from Peking University majoring in physics. In addition to physics competition, senior high school also studied computer competition, and made in-depth research on algorithms and models. He is currently the teacher of the centroid education physics competition.