This book is extraordinarily well done! Its different categories are very useful: During playback you have small corrected exercises and end of each chapter (24 in number anyway) you find two headings "Review" and "Keep Fit" that the latter contains the titles "Self" this is QCM, "Questions of a recruiter" (for those who work or wish to work in electronics), "exercises" to train again, "Deepening" which is other than new exercises and more advanced "Troubleshooting Grid" that will list the points to check for a fault on this type of circuit. However, attention to 2 points: - This book is not for people who have no knowledge in electronics, in fact the explanation is given in a style that risks alienating them from the introductory chapter. - Nothing on digital electronics. In summary, little seemed a bit expensive, but the book is in full color and contains more than 1,000 pages! Personally, I bought and sold any other analog electronic books I had!