Our Pre-K child is very engaged with the way SM presents the material. We have already completed PreK A/PreK B which really solidifies counting, recognizing numbers, and visually, without counting recognizing how many are in a group up to 5. For example, our kid now can look at a die and immediately tell whether there are 3, 4, 5 dots on the side of the die. This creates really great number sense. The pictures and stories are very nicely done, clean colorful illustrations, nice composition on the page, good sequence. We love it. Kid is now almost 5 and we have moved to K A and K B books, hoping to finish them before start of Kindergarten.