How about five-year simulated three-year senior high school entrance examination mathematics? I'm a junior, and I still have English. I know a lot, but I won't do some research. Is it necessary to buy it? Is it effective? I don't think it's necessary, because you are only a freshman and haven't learned a lot of knowledge. That should be used for revision in grade three, right? So, I think you should focus on the data of your school year. You know, the first day is actually the most important time to lay the foundation, and some things can't be rushed. You just need to do it seriously and practically. As far as my math experience in grade three is concerned, as long as you can do all the exercises you usually do correctly, you can learn junior high school math well. Otherwise, you just keep doing the problem and then keep doing it.