We do not recommend that you reschedule classes frequently. It's good to have a fixed time for your weekly sessions so you build a habit and rhythm.
However, should you need to switch times for some reason, you may do so the day before a scheduled class.
Otherwise you may add extra classes or remove classes at any time. Please note that removing classes on the day of the class will NOT change the timing of the class for that day, the change will be only applicable for the following week
Example: Student has a class today - Monday - at 9 pm. At 8 pm, Student logs in and removes the class, Student still MUST attend today's class.
For a detailed breakdown of the types of changes allowed and timing of the change, please refer to the articles below: