Because I am a junior, I once worked as an English tutor for a summer vacation!
First of all, I think the most important thing is to establish "friendship" with children and build their interest in learning mathematics. Because interest is the best teacher and the biggest motivation for learning!
Secondly, it is to interact with children more, pay attention to "entertaining" in teaching, from shallow to deep, from easy to difficult, and use some special methods (for example, using some pictures; Think of those questions as "enemies" to strengthen children's attention (don't be ridiculous, primary school children are very sensitive to these things).
Finally, do a good job of consolidation and review. Because you don't know what children are doing, playing and learning in other time besides tutoring.
I hope my answer is helpful to you!