I bought this book after watching a series of videos on YouTube that mentioned it: https://www.youtube.com/watch?v=BUfkSzhXzVo&t=494s&list=PLnbVBuTUaKZ0ZlFs-xsn4AJgGg2RTGxwQ&index=1 The book has a short introduction and then jumps straight into the question pool for the general class amateur radio exam. For each question, you have the four potential answers, followed by an explanation of the subject and the