1. Applicability: First of all, we should know whether the contents of the teaching AIDS are suitable for our children and meet the requirements of the teaching materials. You can refer to the content and content of the teaching materials to ensure that the teaching AIDS cover the required knowledge points.
2. Difficulty: Choose the appropriate difficulty according to the child's learning level. Generally speaking, teaching AIDS will be graded in difficulty, and you can choose the level that matches your child's learning ability.
3. Knowledge collation: A good teaching assistant will systematically collate knowledge points to help children form a knowledge system. You can check the examples and exercises in the teaching AIDS to see if there are clear ideas and methods for solving problems.
4. Practicality: The exercises in teaching AIDS should be practical, which can help children consolidate what they have learned and improve their problem-solving ability. Let the children try to do exercises to see if they can finish them by themselves.
5. Interesting: In order to stimulate children's interest in learning, you can choose some interesting teaching AIDS. These teaching AIDS usually use vivid examples and interesting illustrations to let children learn in a relaxed and happy atmosphere.
6. Price: Choose appropriate teaching AIDS according to your own economic conditions and children's needs. You can compare different brands and versions of teaching AIDS first, and choose a higher price.
7. Word-of-mouth and evaluation: You can check the evaluation of supplementary books by other parents and students to understand their advantages and disadvantages. You can refer to online comments, ratings and other information to make a more informed choice.