Purchased for about 500,000 yen in 2023. This is a set including problem books, commentaries, key exam questions, exam explanations, and a teacher's manual. It's the latest edition, so it corresponds to the current textbook guidelines. The important points of each textbook content from the first to third years of junior high school are summarized, allowing for efficient learning. For those looking for study materials to prepare for junior high school, this set can be used for regular tests or high school entrance exam preparation. It's more affordable than going to cram school and can be used by siblings, allowing for review and preview of all three years of junior high school. My child found it very useful!! I would like to sell it now that they have successfully passed their entrance exam. It was used by copying into a notebook, so it is in good condition. *Please understand that this item has been stored by a private individual before purchasing.