My son is studying maths with Kumon and he is in K1. My husband has finished Master of Maths so I have consulted him.
He said Kumon is good enough for our son at this stage but when our son is older he will look at the different methods again to see which one is better.
My son has been studying with Kumon maths for about 10 months. He is now doing simple addition up to +4. I am OK with his progress. However, I have to accompany him to do the homework. I do not actually do the homework with him but I sit behind him and make sure he is concentrating. I hope he can be more independent.