After my children entered junior high school, their grades declined seriously, especially in mathematics, saying that they couldn't understand what the teacher said in class. Later, I bought her a math textbook for star education to help her lay a good foundation, and her children's grades improved a lot. I have to say that after buying this book, it really saved me a lot of heart, just like finding a tutor for my children. I not only explained the textbook word for word and one by one, but also taught my children to learn the textbook by hand. The summary of solving problems in the book has also greatly accelerated the speed and accuracy of my children's problems. Recommend full marks! I'm going to buy her textbooks to help her with other subjects, which is good for preview or review.