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[–] 13436149? ago 

Won't work for long. This measures each grade year against the students in the previous grade year (ie: this years third graders scores are measured against last years third graders scores). That does measure cumulative teaching ability (ie: if education is getting better in each grade each year then the trend overall in a particular grade should be upward) but at some point you will get a shitty year of students and they will have to answer for that without looking at those actual students. A mix of the two might be a decent idea (showing both a trend in cumulative education and individual education) but they will never go for something that actually might be helpful when they can just change numbers every few years to make themselves look better.