Preparatory books are crucial tools for learners of all ages, levels, and disciplines. These books provide learners with the foundational knowledge and skills necessary for success in their chosen area of study. Fortunately, there are many synonyms for the term "preparatory book," so learners can find the right tool to suit their needs. Some common synonyms include introductory books, primers, fundamentals, basics, and groundwork. Each of these terms conveys the idea of a foundational text designed to introduce learners to key concepts and skills. So, whether you're studying calculus or learning a new language, there's a preparatory book out there that will help you succeed.