If organisation is your thing, then this book is a total must. It has all the grammar points your need for this level of the exam, organised very neatly, with nice explanations and useful example sentences. the lessons are divided and laid out with a very thoughtful proportion of easy-to-digest- chunks of grammar points. The book actually will guide you through reminding you that when it comes to grammar studying and acquisition, quality beats quantity.
My only let down was that, in my opinion, the book could do with a couple more exercises at the end of each lesson, just to make the learner assert even more solidly the newly-acquired grammar theory. The exercises the book has are wonderful nonetheless. Two exercises by the end of each lesson, one being a multiple choice one and the other a syntax one, just like the very one that the JLPT exam has.
All in all, a great choice if you want to have the general gist of all the grammar patterns encountered for this level, and also a great companion to crash-revise before the test.