The Preparatory Course for the Japanese Language Proficiency Test N3 Grammar and Vocabulary
Unicom publishes The Preparatory Course for the JLPT and each book focuses on a specific section of the test. Each book provides an in-depth look at that section of the test. This is especially helpful if you know your weaknesses and want to drill, drill, drill them away.
This book is for the intermediate level N3 and covers sentence structure, vocabulary, and grammatical phrases.