This book is simply the best Spanish grammar question book that I have ever seen. We used it in AP Span Language class my junior year.. at first assignments in it were dreaded, and most people would get a 50% or less, but as we went through the year, learning more, with these exercises as reinforcement, the constructions, tenses, etc became second nature. The AP test was no problem after this book.. but forgetting that test, and just thinking about this for grammar in general, its great. Touches all categories and formats of questions... good reading selections... high quality in general. I'm actually about to buy a copy for myself, as I've gotten a little rusty in grammar after a long time of pure literature studies. It's just that good.