I have fallen behind in the modules - should I keep listening to the hypnosis track associated with that module or move on to the hypnosis track from the next module?

Once you have listened to a hypnosis track for a week, move on to the next hypnosis track regardless of whether you have finished the module or not.

The only exception to this is the Module 10 hypnosis track. It is important that you complete the Module 10 videos and homework before listening to the Module 10 track.