I'd say this is directed to 4 and 5 year olds, not 3 year olds (which is what "preschool" typically means).
Additionally, the whole box can be done in 4 days, not 4 weeks. I was bummed that some of the activities were simply hiding 5 cards with letters on them and having the kid find them... I was expecting more of the craft activities.
Overall, the activities were fun, but it was definitely not worth the money.