45-Kakan de kanzen masuta- - Yamada M. - N1 bunpou soumatome / Повторяем грамматику (уровень N1) [2012, PDF, JPN, ENG, ZHO]

This is an okay study aid for the N1 grammar; however, I wouldn't rely on it alone. The descriptions in Japanese are sufficient, but the ones in English are less informative and sometimes inaccurate--including a few pretty significant misses. The quizzes are also pretty sparse, so you can't really use it to verify that you've learned all that much. But the few quizzes and having alternate descriptions of grammar makes for a good way to supplement other study materials. So, as I said, I wouldn't use this book alone to try and nail down the N1 grammar; however, if you couple it with other grammar study texts, it may reinforce and add to your insight