Reddit reviews Deutsche Wiederholungsgrammatik: A Morpho-Syntactic Review of German

Deutsche Wiederholungsgrammatik by Frank E. Donahue was what I used to review my German when I was off from university. Very comprehensive and worth the price, IMO.

I think it would really depend on what level of German you consider yourself. Are you looking to advance your grammar, or still learning the basics?
What I'm using right now is this. It talks in depth about the grammar in English, then has many useful exercises in German. Just know it's a review of grammar, not an introduction.