I also have the other two books in this series, 'Spanish Verb Tenses' and 'Spanish Prepositions & Pronouns'. The three together form a really first class set. This book, covering grammar, unavoidably duplicates considerable amounts of the other two but I wouldn't dissuade you from getting this one if you already have either or both of the others. Buy all three.
The tuition and exercises are presented clearly and in well structured form. There are answers to the questions in the back of the books. TIP! Don't do the exercises on the pages provided for your answers! I did - in pencil, fortunately - and spent ages rubbing out my answers when I realised I wanted to revise/recap. I would have needed an ocean of Tippex if I'd done them in ink.
No: do the tests on loose sheets or your pc. The answer pages in the back are perforated. This is very handy [other publishers note - do the same] because it means you can tear them all out, put them in a folder and avoid endless flipping back and forth between questions and answers. If you do your exercises on loose sheets, you can file them with the answer pages and monitor how well you're progressing.
I like the large format, too. It has enabled the publisher to lay the text out in a clear and logical way. The Oxford U.P. books are good, but the small format leads to a very dense and cramped presentation. These books are far superior in that respect.
I thoroughly recommend them.