I used it. It's good. After entering junior high school, I got poor grades in math, mainly because I was slow in doing exams. Later, my dad bought me a "all-in-one" for Star Education. Every time after class, I take time to practice math problems, and gradually I find the feeling of doing them. The speed and accuracy of doing the questions have been greatly improved, and my grades will naturally go up slowly. Generally speaking, the questions in this book are balanced in difficulty, novel in title and comprehensive in content. And sometimes even if I can't do the problem, I can understand it at a glance just by looking at the matching answer analysis.