How about it for summer vacation study? This is a starter problem book for those considering elementary school entrance exams, but I think it's perfect for trying out Koguma-kai. Even for children who are not taking the exam, you can easily understand their current abilities. There are many cute pictures and a wide variety of problems, so I was able to work on them without getting bored. It's easy to understand strengths and weaknesses, and I think it's perfect for the first book. A4 size, easy to write on. Please try it at home during the rainy season. For ages 4 to 6 I used a copy, so there are no writings, but there is a feeling of use. The understanding of the story is almost new. #ElementarySchoolEntranceExam #KogumaKai