Seriously study the real problem. The real questions should be done at least twice (by year, by knowledge point). Mathematics does not advocate doing simulation problems and betting on papers.

Now the simulation questions of various institutions and publishing houses are compiled by themselves, and the difficulty is not consistent with the real difficulty of the postgraduate entrance examination. Unless you are particularly good at math, ordinary people are simply wasting their time. The real problem is not done at once, so we should carefully study the angle of doing the problem and summarize the wrong problem. After that, you can find an earlier real question on the Internet and print it out, which is more reliable.