Since I signed up for the N3 this year I was looking for a resource that would help me focus on whats on the exam. For the N4, I had gotten N4 スピードマスター which I like, but when I was looking up the reviews on the N3 series, people said there were translation errors on the grammar book that made it kind of pointless. I had also bought パターン別 N4 which I actually hated since the grammar explanations were terrible.
However, this time around I was thinking of getting the grammar and reading editions 日本語総まとめ and was just looking for the experiences of other fellow Wanikani members. I also plan to get one of those exam books, （日本語能力試験）