World of Fun Learning This series consists of Nursery Buddies English, Nursery Buddies Maths and Nursery Buddies Science. Each subject comes with two main books and two activity books. The two main books of each subject provide attractive stickers for more fun. Nursery Buddies series helps stimulate interest in learning and build 21st century skills. The books of this series also help develop Higher Order Thinking Skills (HOTS). Higher Order Thinking Skills (HOTS) are thought processes that go beyond memorisation of facts. They require more complicated thought processes.