This study aims to investigate the key determinants of the quality of education of upper-secondary schools in Thailand focusing on the Bangkok Metropolitan area. Among the 219 the upper-secondary schools located in the studied territory, 149 schools under the supervision of the Office of the Basic Education Commission, Bangkok Metropolitan Administration, the Office of the Higher Education Commission, and the Office of the Private Education Commission were randomly selected. This sample size provided a 95 percent confidence level for all statistical ...