A in joint recruitment area and B in non-joint recruitment area. According to the website information of Chengdu Education Bureau, Volume A of the senior high school entrance examination in Chengdu is Volume A of the joint recruitment area and Volume B of the non-joint recruitment area. Chengdu, also known as Rongcheng and Jincheng, is a prefecture-level city, provincial capital, sub-provincial city and megacity under the jurisdiction of Sichuan Province.