If math is poor, we must first grasp the foundation and thoroughly understand the knowledge points in each chapter. If you have the time and determination, you can buy an online course of hammer mathematics. The course of the hammer line is quite good, with a system and a framework. Each chapter has a problem subdivision, as well as fill-in-the-blank questions, analytic geometry, application questions, functions, and the last four questions of the series. Personally, I think it is very detailed and the number of questions is really large, but you can really make great progress by following the rhythm of online courses.