No. Only students for whom I have received the registration fee and form are guaranteed a place in the class, for two reasons:
In the past I have turned students away because I was holding a spot for a student who ultimately did not register, leaving me with an unfilled spot that could have been filled. Most importantly, though, registration is a significant indication of parental commitment. I want students whose parents are convinced of the value of the class. The commitment of my writing parents is crucial to the progress of their students.
I want all parents who join my classes to be confident in their decision, so I never use "sales techniques" to encourage someone to register. However, if you are thinking of registering but have questions, I will happily discuss your questions to give you the information you need. I will also put you in contact with one of my Veteran Writing Parents who can answer your questions from a parent's perspective.