National Ranking is actually based largely on the total number of Advanced Placement tests taken in our high school (9-12) divided by a small graduating class. During the years that Corbett ranked the highest, the criteria had nothing to do with how well students performed on those tests. All students (grades 9-12 take these AP tests). The district has purchased over 1,000 AP tests during a single year before..... We even require Special Needs students to take these AP classes/tests.Read more here.