I think even if you’ve already gone through another really good verb review book like Dorothy Richmond’s "Practice Makes Perfect: Spanish Verb Tenses", this one is also worth getting. There are some things one book goes over that the other doesn’t. (goes both ways..) One thing I remember off the top of my head that is shown very clearly in this book that I don’t remember from PMP is the way you use the “passive voice”: How to say things like :

“The food was prepared” vs. “The food was prepared by the chef”
(When it isn’t specifically stated that someone is doing the action, you would use ‘estaba’ for the word ‘was’, and when you include who did the action, you would use ‘fue’), so,
“La comida estaba preparada.” vs. “La comida fue preparada por el cocinero”.

What both books have in common though is that there are LOTS of exercises and really good, clear explanations on all the tenses as well as an answer key in the back.

Both Practice Makes Perfect: Verb Tenses and The Ultimate Spanish Verb Review and Practice are about $10 each on amazon.com. And in my opinion, everyone serious about learning Spanish should get both. It really is a good value for what you learn! ( )