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.
Levels from N3 to N1 are divided into five parts. You can focus on one area in which you feel the weakest, use the textbooks alternately, or all at the same time: Vocabulary, Kanji, Grammar, Listening Comprehension, Reading Comprehension. In this part you will find grammar exercises at the N1 level – grammatical constructions with an overview, examples and exercises.
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. Good luck!