every school is a good school?

No. The value of a school is determined by its core values, disciplinary structure, programmes offered, and most importantly, its staff (management and academic). While structures can be set rather easily, the hardest factor to ensure, is the quality of teachers, as well as the strength of its management team (Principal, BP, admin etc). While most staff start out with good intentions to provide a conducive learning environment for all students, these intentions tend to be worn down in an environment where management is either not supportive, or students consistently test their nerves. It takes a set of really dedicated teachers and staff to rise above these. Solid teachers value add to their students' learning, enabling them to be inspired and do well academically and otherwise. Thus they contribute significantly to how 'good' the school can be. Historically good schools tend to attract students with better ability and attitudes, and this allows teachers there to teach more effectively with less distractions to handle, which leads to majority of students performing well in their exams.... And the cycle goes on. Once a school starts to gain a notorious reputation, it leads to a vicious cycle of attracting underperforming students as well as demoralising the work of its teachers and staff. The cycle perpetuates, and only in rare cases do u see a school break out of them.