The quality of education is the quality given at school. Many things are measurable, such as the test results, but not everything can be measured.
Educational quality includes not only the effective learning of knowledge and skills, but also transforming children into independent, self-responsible individuals. And that cannot be expressed in numbers.
It is important that we, as a school, monitor the quality of education properly and try to improve it. This is called quality assurance. The Inspectorate of Education's core task is to monitor the quality of education.