Quick approach, very clear,
レビュー対象商品: 日本語総まとめ N2 文法 (「日本語能力試験」対策) (単行本)This is a good book for people with limited time. It shows the examples with the translation in English (so you don't have to look for the words you don't know or wonder about the meaning of the expression until you get it). It's very clear, concise, schematic, easy to use and offers a good amount of practice.
The lessons are structured in an eight week study plan, two pages a day and it's working great for me so far.
However, if you want a more thorough approach and/or have lots of time in your hands, chose Kanzen Master instead. I`ve found myself using this book more since its easier to understand and goes straight to the point and then checking Kanzen Master only when I want further explanations or practice on some grammar patterns.