The real test paper and the black-and-white test paper are all real questions over the years, but their characteristics and uses are different, so it is impossible to compare which one is better. Zhenti sub-main volume: Zhenti sub-main volume is a set of practice materials formed by sorting out the real questions over the years according to the test sites, difficulty and other aspects, which can help candidates get familiar with the examination rules and improve their problem-solving ability and test-taking level. Black and white: Black and white is a simplified version of the real test paper, that is, the real test paper over the years is simplified and reduced, and finally a set of test questions is formed. The advantage of writing in black and white is that there are fewer questions and the answers are relatively simple, which is more suitable for candidates to review and practice. To sum up, the main volume of the real question and the black and white volume have their own advantages and disadvantages, and the choice should be based on the actual needs and conditions of the candidates.