https://blog.gongquiz.com/2022/06/07/student-%ed%85%8c%ec%9d%b4%eb%b8%94%ec%97%90-%eb%8f%85%ec%9d%bc%ec%96%b4%ea%b3%bc-%ed%95%99%ec%83%9d-50%eb%aa%85-%ec%a4%91%ea%b5%ad%ec%96%b4%ea%b3%bc-%ed%95%99%ec%83%9d-30%eb%aa%85-%ec%98%81/