I purchased this book to take a course, but it became unnecessary as I ended up getting a job in a completely different field. I read about 10 pages over two days and then stored it on my bookshelf at home for about two years. I don't think there are any particular issues, but please consider that this is a used book that has been kept by an individual. "The Easiest IT Passport Textbook for Guaranteed Success + Practice Questions Sorted by Frequency, 2021 Edition" Kyosuke Takahashi Price: ¥1580 #KyosukeTakahashi #Kyosuke_Takahashi #book #Electrical/Mechanical/ElectronicCommunication