Wan Wei's black-and-white volumes are divided into seven families. "Black-and-white papers" are two sets of papers secretly recorded before the exam, including general contents (including black papers and white papers): the black papers highlight the required test points, and the answer activity column is re-explained. The white paper focuses on supplementary speculation. Use black rolls first, then white rolls. Because black paper emphasizes guessing and explanation, you can practice all kinds of required test points and questions and get familiar with all kinds of knowledge points after you finish black paper and check and analyze (there are expanded guessing and activity columns in the analysis). Master these and make a blank sheet of paper. Centering Volume is the last set of pre-test compositions planned and published by Wan Wei Education. This set of compositions is listed after the final exam is finalized (that is, the final exam is completed).