Hello, I would like to ask when to use the math sub-item reinforcement that must be brushed in the college entrance examination. The college entrance examination must be used when brushing math sub-questions and strengthening the second round of review. In fact, the strengthening of the sub-questions of the college entrance examination questions is mostly used for the second round of review. Special training, problem solving or big problems all need intensive training. After the training, you can check the answers according to the chapters and questions to see if you have done it right, as well as detailed analysis and difficulty analysis to help students improve their problem-solving ability.