This is from the 2022 academic year. In Understanding and Mathematics, there are a few places where the tutor wrote notes on important points, which have been left as is. In English, there is also a page with a corner folded as a mark by the teacher, so please be aware of this. There is nothing written in Japanese, but the corners are folded from the move, so please check the photos. Video explanations can also be viewed from the QR codes. These 5 books are not for solving problems, but rather summarize the key points, so please be sure to purchase them with this in mind. These are used items, and we are selling all 5 books together at a discounted price, so we will sell them to those who understand.