Are you going to make it for the children? Now, the strategy of asking ocean questions is out of date. It costs money to buy so many counseling materials, and I don't know if it's good or not. My husband found a math kingdom with buttons for his children, which is quite good. There are many modules in it, which can be studied, tested and evaluated, played and relaxed, and repeated consolidation exercises that can correct wrong questions. After a set, the child mastered a lot of mathematics knowledge. The latest thinking expansion module helps children to disperse mathematical thinking, and now children will take the initiative to think about problems. There is really a lot of math knowledge in it. It's a little difficult. I can't even do it! Alas!