Here are the three reference books I used to pass the Class 1 Sanitation Manager exam in 2024 on my first try. I reread them many times, so there are some wrinkles on the covers and marks from being pressed by other items in my bag if you look closely. However, I didn't write anything in them, and I didn't fold the pages. I used these reference books while keeping them in good condition, assuming I would sell them after passing. The pages themselves are in good condition. These three books are necessary to pass the Class 1 Sanitation Manager exam. The first book, "Pass with This One Book: Kazuhiro Muranaka's Class 1 Sanitation Manager Text & Workbook," is a comprehensive reference book, but some parts are not well organized, and some sections simply present the information you need to memorize in a merciless table format. Therefore, I don't think it's enough to rely on this book alone to pass the exam. The passing score for the Class 1 Sanitation Manager exam is 60%, but the tricky part is that you need to answer at least 40% of the questions correctly in each section. This textbook and workbook alone don't cover everything. To supplement that, I recommend the second book, "Complete with This: Kazuhiro Muranaka's Class 1 Sanitation Manager Past 7 Exams Question Collection." This book contains questions from the past 7 actual exams. In other words, you can understand the standard difficulty of the questions. The exam questions from the most recent exams are more difficult, and the mnemonic devices often seen on YouTube are not sufficient to answer them. Therefore, I recommend starting with the older exams. As you solve past questions, you will eventually identify your weak areas. To overcome those weaknesses, you'll need the third book, "Class 1 Sanitation Manager: 1500 Perfect Q&A." By studying your weak areas diligently with this Q&A book, and going back to the first textbook to check the content if you don't understand, you can deepen your understanding. In other words, you only use the Q&A book for the parts you are weak in. Fortunately, the last chapter of the Q&A book includes the latest past questions and answers that are not included in the second book, so I recommend using it for the final review. I studied for about two months, bit by bit, during my free time after work, and I successfully passed on my first try. I hope you can also receive this good luck. May the chain of success be born from these three books.