This study was done to find out the correlation between the number of students in the school and the academic achievement; and correlation between school location and academic achievement. For the quantitative analysis, the national result of 110 middle and higher secondary schools (class 10 and 12) from 2015 to 2019 was taken from Bhutan Council of School Examination and Assessment (BCSEA). For the qualitative analysis, feedback was collected from 25 teachers who had an experience of teaching in both rural and urban school. For quantitative, the correlation analysis, descriptive analysis and t-test was done; for qualitative, thematic analysis was done. The study found that there is negative correlation between the number of students and the school achievement. The correlation coefficient was -0.2, -0.3 and -0.4 for the year 2017, 2018 and 2019 respectively. However, it showed moderately negative correlation in all the years except for 2015 which was 0.02, a positive correlation. The comparison of academic achievement of rural and urban schools showed that rural schools have done slightly better than the urban schools in all the years. The average pass percent difference was 0.5, 0.3 and 3.6 in 2017, 2018 and 2019 but in 2015 urban school did better by 2.3 percent more than remote schools.