I don't know about the others. Anyway, I used Tang Jiafeng's relay inscription 1800, which is super easy to use. I took the postgraduate entrance examination for mathematics for 22 years 148 and went ashore directly. If you really used 1800, you will know that the answer analysis of 1800 is super detailed, and the supporting video also talked about the pit avoidance rules. We have one copy for each of the six people in the same dormitory 1800, and passed the math 140. Of course, it can't be said that it's all due to Mr. Tang 1800, but Tang Shen's advanced mathematics guidance handout and relay 1800 are necessary, necessary, necessary! In addition, I bought a full set of mathematics counseling books for postgraduate entrance examination from Mr. Tang, and explained them one by one with the video of Mr. Tang at a certain station. It smells really good! These are my personal feelings and are for reference only.