For Chinese, it's best to buy a complete textbook, because this book is very good for teaching material analysis, so that you can easily understand the meaning and key points of the text that the teacher doesn't understand in class. It's best to have exercises in math and English, such as at o'clock (the topic is a bit deep), at 3: 1 test, Huanggang question bank and so on. Of course, if you want to understand the tutorial, the complete textbooks of mathematics and English are also good and comprehensive. I'm in grade three, too. You can go to the bookstore to read these books. The teacher also thinks that the reference book used is good, so you can try the reference book: Complete Explanation of Mathematics; Interactive English classic learning channel; A complete interpretation of physics teaching chemistry; A complete interpretation of the study plan of top students in history; Biological zero error; A complete geographical explanation; Mathematical practice and measurement practice; The lightness of physics wins the championship; A+ optimization of training biology; A+ optimize training geography to win the championship; Point chemistry in English teaching taught by Huanggang famous teachers; Mid-point practice and measurement of ideology and morality.