Does anyone have the Core Knowledge Preschool book? Do you like it? Is it worth buying? What kind of stuff is in it? I have the 1st grade edition. Is there a Kindergarten book? Should I just buy Kindergarten and skip preschool? I am trying to write education goals combining preschool and kindergarten material for this year for ds. He will be 4 in a few weeks. If you have the preschool book and or the kindergarten book I would appreciate your thoughts.