Should you do these classes in order?
There is no particular order for these sessions. Note that each class has the forms listed in the description so you can pick and choose which ones to do if you like. If some of the forms are new to you, then I'd suggest repeating the same class a few times before moving on to a different one. You could also choose to follow all of the classes that contain a particular form as they are taught with different cues each time. That way you repeat the chosen form, but vary the accompanying forms and learning points. Be methodical or mix it up – make it work for you!