The day of purchase. Zhonggong textbook is a civil service examination textbook compiled and sold by Zhonggong Education Group. Zhonggong Education, founded in 1999, is an information technology and education service organization, and its teaching materials are sold on multiple platforms. The brand sends textbooks sold by various platforms at 6 o'clock every night. The brand was selected as one of the top 500 listed companies in 20 19 on October 3rd, 2020.