One of the mistakes educators make is believing the conclusion that what we try to do can be reduced to a number. The value (economic, political, cultural) of an individual or population lies in its variation. We should cultivate that more than seeking standardized students.
@garyackerman and thus, as a vocation, we must prize educators higher than we do now, invest in their understanding of variation in its potential and its governance, and in their wisdom to help the individual seek self-actualization.