The goal of this study is to determine the best attention hours for older students. We took a sample of 204 fifth graders and 202 tenth graders. They were separated and put into three groups (high, average and low ability) based on their mean yearly mathematics achievement scores. According to the results in the afternoon when fifth grade attention levels are highest, during the morning hours, students in the tenth grade reported an increased concentration. Among students in tenth grade, but not among others.