The Toledo Islamic Academy in Ohio, the International School of Indiana, the International School of Minnesota and the College Prep School of America in Illinois all rank the highest in the Midwest, according to the Washington Post's list of most challenging private high schools. The Washington Post takes into account several factors when determining the rank of high schools included in their annual list.
One of the most important components is the total number of Advanced Placement, International Baccalaureate and Advanced International Certificate of Education tests given at a school each year. The sum number of tests given is then divided by the number of seniors expected to graduate at the end of the school year. The creators of the list did not count the results of these tests, largely due to the fact that many school administrations keep those rates artificially high by only allowing top students to take the tests.
While the original list includes public schools in the rankings, visitors to the site can filter results and view the top 81 private high schools, nationwide. Other Midwest schools mentioned are the Islamic Foundation School of Illinois, Mary Institute and St. Louis Country Day School, Eastbrook Academy in Wisconsin, St. Francis High of Michigan and John Burroughs in St. Louis, MO.