The Nihongo Sō-Matome textbook series is intended for everyone who would like to prepare for the Japanese Language Proficiency Test exams or simply learn Japanese in a structured way. The series features books at every level, from N5 to N1.
N4 level is divided in two parts. In this book you will find tasks in the following areas: grammar, reading and listening (the book comes with a CD with audio recordings). It is enough that you go through two pages a day, and in six weeks you will master the entire material. At the end of each week you will also find a small test. In addition to all the Japanese language exercises, the textbook from time to time also gives tips on how to deal with the JLPT exam stress-free – and points out the most common difficulties and tricky places. Good luck!