A Study on the Possibility of Assessing Children’s Development Using an Exercise Workbook Based on the Kumon Method: A Case from the Preparatory Group of Preschool Education. JIS [Internet]. 2026 Jan. 1 [cited 2026 Jan. 9];3(4):63-6. Available from: http://gipublishing.org/index.php/jis/article/view/108