I teach preschool special education for 3-5 year olds. I will be beginning zoo-phonics with them next week. I noticed in the book that they introduce a different group of letter pictures/sounds each day the first week. Has anyone with special ed. children done this? I was wondering if maybe I should work on the first group the first week, then move onto the second group the second week, etc.? I'd love to hear from anyone with experience with it!