Most of the answers are very simple and understandable, definitely worth the 20 euros. It saves you countless hours from searching for answers online and not knowing if they are correct or not. The only downside is that, first, it doesn't include the indicative answers for the practical part, while they have done a decent job on the theoretical part, but the book should have pointed out that it wouldn't include the practical part, and secondly, some answers are excessively long. Answers that I know and would take me 100 words to say are stretched to 2.5 pages. This makes the book 400 pages long when it could easily be 200.