He is better than other students, so he must be interested. Mathematics is a subject that always deals with boring numbers, so if you want to be interested in learning, first, learn well before you are interested. Or you should pay more attention to study with him and help him develop interest. Such as: a sense of accomplishment or true consciousness of a math problem, the practical value of mathematics, and so on. In a word, we need the help of our parents. In this way, children's grades will also improve! However, it should be noted that we must give priority to guidance and not force it, otherwise it will produce resentment and backfire.
As for magazines, I think the weekly Mathematics for Primary School Students (Grade Four) is quite good. it wont hurt you to try it My relatives' children use this.
The following is my personal experience about "learning mathematics well". You may wish to refer to them:
Mathematics Mathematics is dealing with numbers, so to learn mathematics well, first of all, don't be lazy, be familiar with numbers and calculate more. Be sure to calculate more, very familiar with it! Secondly, you must be familiar with the basic knowledge of mathematics. Only when you are familiar with the knowledge points can you do the questions easily! Third, do more questions, and you can get high marks if you are familiar with them. To learn math well, you must do it well. Third, it can be adjusted according to personal circumstances and time allocation.