Summary:
The Adlai E Stevenson HSD 125 list includes one school, Adlai E Stevenson High School, serving grades 9–12 with 4,758 students. Most importantly, in 2025–26 the school was above the state proficiency rate in all nine reported subject-and-grade comparisons, with advantages ranging from 30 to 44 percentage points.
Adlai E Stevenson High School is the only school listed, so there is no school-to-school top or bottom comparison. Its strongest state-relative result was grade 11 ACT mathematics: 84% proficient, 44 percentage points above the state. Mathematics showed the largest average advantage across grades, while English Language Arts had the smallest; even the smallest gap was 30 points, in grade 9 PreACT English Language Arts. SchoolDigger gives the school a 5-star rating and ranks it 8th of 738 schools, in the 99th percentile. Other reported outcomes were also better than state figures: graduation was 96% versus 90%, dropout was 1% versus 2%, and chronic absenteeism was 21% versus 24% in 2025–26.
Recent test-score changes were mixed, rather than showing a consistent rise or fall: results rose in three comparisons, stayed the same in one, and fell in five from 2024–25 to 2025–26. Grade 9 PreACT science had the largest decline, down 6 percentage points to 82%, while grade 9 PreACT mathematics rose by 2 points to 85%. Across the nine comparisons, the average advantage over the state narrowed slightly, from 38 percentage points to 37. As context, the school’s student–teacher ratio was 15.9:1 in 2024–25, and 5% of students were free/reduced lunch eligible in 2021–22.
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