We have two normal ways for booking classes. One is partner schools directly assign a whole class session (normally will last for several weeks) to your open slots, and you will receive email notification at least 48 hours in advance. The other is we sent you emails regarding the classes you can take, and those “race” emails follow the first come first served principle. Both ways are regular and both ways are working.
In addition to these two method, sometimes we would ask tutors to urgently take over a class for an absent teacher. In this case, we will contact you first via chat/email, and those classes will only be given to you when you answered yes.