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Quick Mastery of Vocabulary - In Preparation for JLPT N4 & 5 is a popular vocabulary resource for the JLPT. The book is organized by themes, grouping thematically similar words together, like for example "family", "clothes" and "nature". In addition, there is a checkbox for every word, making it easy to continue where you left off. Its structure makes it straight forward and easy to use, resulting in a consistent learning experience.