In fact, any book is good, depending on how the children do it. Many teachers recommend 5.3 exercise books, Huanggang cheats, one lesson and one practice, etc. These teaching AIDS are not bad, and there are supporting papers, one for each unit, and mid-term and final papers. The topics of the supplementary books are concise and clear, and they are all classic questions with answers. The number of topics is not much, which is quite suitable for first-grade children, with both foundation and improvement after class.