It is best to use it once. Science is mainly about brushing more questions. There are many questions at a time, and the answers are clear and complete.

To analyze the paper, we should first find out where the main points are lost, whether the hit rate of multiple-choice questions is too low, whether the fill-in-the-blank questions are always forgotten, or whether the big questions can't be written or done, and so on. The most important thing is to understand what is the first problem you need to solve next: whether to learn standard writing and answering skills, or simply lay a good foundation.