Preschool in a box delivered to your home ready to open and get started! Each Kindercarton is based around a theme; all items are carefully curated to support the theme of the month. Every month, you'll receive: word cards to build vocabulary, 2 books, games to play, Math and Language activities, crafts, recipes, and a complete parent guide. GR4K's curriculum is based on state early learning standards and developmental guidelines from the CDC/US Department of Education.