I once applied for one-on-one math in Yu Ming. At that time, I was admitted to Peking University, and I was only admitted to the upper and lower volumes of mathematics. Teacher Chen told me that their math class can reach 130+. In fact, at that time, I was stupid enough to want to enter Peking University. I have classes once a week. How much do you think I can finally learn? I haven't finished the first volume. If I hadn't taught myself the complete works of Li Yongle and followed Yu Ming's courses, I would have been in come to a bad end. In fact, it is enough to buy a video class from a postgraduate school in a treasure. If you forget, you can look back, but the update is a little slow (not much slower).