Maybe, if mpacc wants to get 280, it is essential to do the problem. You must do it at least three times. Do it carefully the first time, do the wrong questions the second time, and do it the third time until you know all the knowledge points and test sites. There are many exercise books in mpacc. You can consult successful seniors and choose exercise books suitable for the exam. Do the problem three times when you start. Do each question in order the first time, then correct it with different colors of pens and record the wrong questions. Do the wrong question the second time and finish it all the time. The third time, do the topic again from beginning to end. If you see an idea in your mind, you can make a mark at this moment, indicating that the topic has been learned. If you have no ideas, do it again and sort it out again until all the topics in the book can be done. In the basic period, it is best to repeat the knowledge points and wrong questions every other cycle to help the understanding of the previous knowledge and the learning of the later knowledge.