Oranges, four sets of papers for math postgraduate entrance examination are very good. The test paper is used to simulate real questions, and this score does not represent the final score. The most important thing is how to make good use of these test papers, reasonably arrange time to do objective and subjective questions through the test papers, and then fill in the gaps through the test papers, summarize the mistakes that are easy to make, and try to avoid making these mistakes. The four sets of papers are moderately difficult and can be used to check for leaks and fill gaps.