I had a boss that used to say "you're teaching this in 2 weeks". Many people have commented that it is essential to have an outline to follow. I used to spend a couple of hours the evening before the class going over the material.
I found that inevitably there were a couple of people who lagged, a bunch of people who would keep on track and a couple of people who would be way ahead of schedule. I quickly came to realize that I needed to have a bunch of little projects to keep the quicker people occupied while the rest caught up. You might want to direct the teacher to the Q&A section of the Monastery
Jeff