The use of free time is extremely important for a student. First of all, a student can choose to review for exams, lessons, and assessments. Moreover, playing video games or chilling inside bedroom watching netflix, basically relaxing can also be another choice. In addition, some might choose to hang out with friends or go to parties. Nevertheless, a part of students might choose to exercise and train their body.
With all the choices listed, students can only choose one, and the others will become the opportunity cost. This would be important because a student can either choose to study hard to get good grades, train hard for his or her phyiscal body, or to relax.