A report published by the Washington Post ranks Evanston Township High School 12th in the state of Illinois and 639th among all schools nationwide.
The ranking is created by dividing the number of advanced placement and other college-level tests a school gave in 2010 by the number of graduating seniors.
The Post, in the study published earlier this month, says the result is "not a measure of the overall quality of the school" but "can reveal the level of a high school's commitment to preparing average students for college."
Four magnet schools in Chicago and seven suburban high schools scored higher than ETHS among the 86 Illinois schools in the report.
With the exception of two of the Chicago schools, all the higher-scoring schools had a lower percentage of low income students than ETHS.
The Post has been ranking Washington-area schools this way since 1998, and expanded it this year to schools nationwide.
Online discussion with the report's author (Washington Post)
Availability of AP classes varies widely across state (Chicago Tribune)