The second volume AB of college entrance examination refers to two papers of the same subject, in which the content of questions in Volume A and Volume B is similar, but the specific order, questions and difficulty are different. Generally speaking, there is no obvious difference in the difficulty of volume A and volume B, but it will be slightly different when it comes to some contents or knowledge points. There will be some differences in details between Volume A and Volume B of some disciplines, such as different classical Chinese or articles in Chinese, history and other disciplines, or different requirements for some details in mathematics. In terms of examination time, the examination time of college entrance examination volume A and volume B is the same, but it is arranged in different time periods to cope with the large number of candidates. Regardless of whether it is Volume A or Volume B, candidates should master the relevant knowledge points of the subject and strive to achieve good results.