This set includes books for learning, from a beginner's guide to business for new employees, to C language, IT Passport exam preparation, and a fun AI self-made classroom covering the basics to practical application of AI. - Book ❶: Karaage-sensei's Really Fun AI Self-Made Classroom (2020) - Book ❷: IT Passport Exam Preparation Textbook (2020) - Book ❸: Introduction to C Language (2014) - Book ❹: Introduction to Mechatronics (2014) - Book ❺: Fresher's Course (2022) - Book ❻: IT Passport Textbook for Beginners (2014) As shown in the last photo, Book ❷ is missing the inner cover. Other books may have some writing or cover damage, but not much. Also, as mentioned above, the publication dates are a bit old, such as 2022 or 2014. Please consider this carefully if you are concerned. Personally, I don't think that relatively established topics like C language are outdated. Conversely, Karaage-sensei's book may require you to read and reinterpret it while researching on your own, due to changes in Google Colaboratory. My favorite of these is Fresher's Course. It was a great help when I was job hunting. Thank you for looking.