Jay Matthews:

We take the total number of Advanced Placement, International Baccalaureate and Advanced International Certificate of Education tests given at a school each year and divide by the number of seniors who graduated in May or June. I call this formula the Challenge Index. With a few exceptions, public schools that achieved a ratio of at least 1.00, meaning they had as many tests in 2013 as they had graduates, were put on the national list at washingtonpost.com/highschoolchallenge. We rank the schools in order of ratio, with the highest (21.91) this year achieved by the American Indian Public Charter in Oakland, Calif., which repeats as the top-ranked school.

I think 1.00 is a modest standard. A school can reach that level if only half of its students take one AP, IB or AICE test in their junior year and one in their senior year. But this year, just 9 percent of the approximately 22,000 U.S. public high schools managed to reach that standard and earn placement on our list. On our list, the top 220 schools are in the top 1 percent nationally, the top 440 in the top 2 percent, and so on.

Madison Memorial made the list at #33 in Wisconsin.

Somewhat related: Madison’s on and off again “high school redesign“.