This study attempts to investigate the effect of educational indicators and on the 12th grade students’ performance in Sultanate of Oman. The data is collected from Data Resource System (DRS) at the department of statistics, and the Educational Evaluation System (EES). The multiple linear regression is performed to study the effects of the predetermined of educational indicators such as class size, school size, school type, student/teacher ratio, teacher/class ratio and student gender on the students’ p