It is hard to improve your test scores when they are already so high. Do you take that into account?
Yes, that is true and we did take that into account. When the gain scores that measure improvement are calculated, students are compared only against other students with the same test score the previous year. So low-scoring students are compared to low-scoring students and high-scoring students are compared to high-scoring students. You can see in our rankings that schools with very high test scores to begin with can also score very high in growth.