Good point. 99% of teachers in general are average and mediocre and only follow the same collection of textbooks.it does not matter if they have a PhD. It can take long time,years to find a good teacher.

GaoKao, CET4, TEM4: When EVERY student spends their entire childhood and young adulthood learning the SAME material to answer the SAME questions on the SAME days as EVERYONE else, how is it possible for them to understand that learning is in fact a PERSONAL journey to discover who YOU are and how to live YOUR life?