I am selling these books because I passed the Denken 3 exam. They have been used, but there are no stains or marks. I passed the exam by using these textbooks, past exam questions, and online explanations. I will not sell these items separately. [Contents] This set includes textbooks and workbooks specifically for each subject of the Denken 3 exam. It covers the four areas of Power, Theory, Regulations, and Machines. "Minna ga Hoshikatta Series" (The Series Everyone Wanted) [Target Audience] This is ideal for exam candidates aiming for the Denken 3, or for those who want to deepen their knowledge in related fields. - Title: Denken 3 Power Textbook & Workbook - Title: Denken 3 Theory Textbook & Workbook - Title: Denken 3 Regulations Textbook & Workbook - Title: Denken 3 Machines Textbook & Workbook Thank you for looking.