This book is designed to help learners efficiently master the grammar required for the JLPT N1 in 45 days. Over nine weeks (45 days), learners will cover three to five grammar points per day, including essential grammar and keigo (respectful language). After each day's study, a review test allows learners to check their understanding. The first example sentence for each grammar point is accompanied by explanations in both English and Chinese, making it ideal for self-study.