Very effective. I am a senior three student. I bought a math class in my sophomore year and followed it. Before I bought the class, my score was 100. Before buying classes, I also bought various exercise books. I have done a lot of problems, and I feel that doing them will have an effect, but the effect is not great. No teacher helped me. This is an online course. If you don't understand at home, you can listen to it again and again. No, there will be a teacher to help me solve it. I don't know about other subjects, but math is still good, especially the seconds kill of multiple-choice questions and fill-in-the-blank questions, which is very useful in the exam. I saved a lot of time in the exam. Now I mainly use mathematical lists, and the review is very targeted. I bought a punching class a few days ago, mainly focusing on training. I am a science student, hoping to break 140, and want to sprint Wuhan University. I'm glad my answer can help you. Thank you for your adoption.