Although there are no written markings, it has been used and shows signs of wear. Also, there is a fold on the back cover. If you are purchasing this along with other texts, please let me know before you buy. I can offer a discount if they can be shipped together. 【What is Selected Training Math?】 A simple structure consisting only of problems, with no explanations or other text. Ideal as a supplementary material for basic problem repetition and homework. ○ Thorough drills for developing basic skills. ○ Ensures a sufficient "amount of practice," which is most important for solidifying fundamentals. ○ Because the important items of each unit are broken down into detailed patterns, you can acquire accuracy and speed by repeating the training. ○ The curriculum is the same as the year-round textbook "Standard New Exercises," so you can repeat the content of "Standard New Exercises" and further improve your learning effectiveness by using them together. ○ As a drill material, it is also ideal for homework, home study, and as a supplementary material.