I work at Kumon part time like for half a year. I do not think that the teachers are more experience in Kumon because they are usually part time teachers that are either studying in college to earn extra income or working during semester break. But this varies between centres.. Another thing is the location of the centre, some centre have more students that other centre so students will get less attention in the busier centre than the quieter centre. Plus some centre also offer Mandrin or Japanes depending on the instrutor. The Centre that i work have math, english and mandrin.

Kumon does not work for every child because the main objective of kumon is able to solve the problem on your with minimal quidelines from the teachers. Some may excel and some will struggle. Furthermore, if the child have an early start and they understand the concept, then they can go far but i Have seen that students in secondary school just enter Kumon and they find it boring because they are doing lower level of maths than what they are learning at schools. So they will be bored with the lower level and not motivated to do the homeworks.