All classes can be cancelled until the day before your lesson 8PM without any fee. If you need to catch up with some lessons, you can also try to find some time with your teacher outside of your weekly booked schedule when both of you are available.
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What about the payment methods?
If you are outside China, you can pay by bank transfer or Paypal. If you are in China, you can pay by bank transfer, cash deposit or Paypal.