Summary:
ZIP code 60655 has four schools: three elementary schools and one high school. The elementary schools’ 2025–2026 all-grade ELA and math proficiency results were all above state results, while the high school’s ACT and PreACT results varied by grade and subject. Overall, the clearest finding is that elementary performance is uneven, with Keller Elementary Gifted Magnet School far ahead of its local peers.
Keller Elementary Gifted Magnet School led the elementary schools with 99% proficiency in ELA and 97% in math, compared with 82% and 61% at Mount Greenwood Elementary School, and 67% and 53% at Cassell Elementary School. Keller’s lead over the other two schools’ average was 25 points in ELA and 40 in math. All three were above state results of 56% in ELA and 40% in math. SchoolDigger ranked Keller 1st of 1,737 Illinois schools and gave it five stars; Mount Greenwood ranked 172nd and also received five stars, while Cassell ranked 490th and received four stars. At Chicago High School for Agricultural Sciences, 11th-grade ACT ELA was 53%, above the state’s 50%, but math was 31% and science 44%, below state results.
Elementary results shifted differently by school between 2024–2025 and 2025–2026: Keller rose 3 points in ELA and 4 in math, while Mount Greenwood and Cassell declined in both. Across the three schools, the average ELA advantage over the state narrowed by 5 points; the math advantage narrowed by 1 point as the schools’ average stayed about the same. Other measures offer context, not explanations: for 2024–2025, free/reduced lunch eligible shares were 39% at Keller, 16% at Mount Greenwood and 20% at Cassell. Student–teacher ratios ranged from 10.4 at Cassell to 17.1 at Mount Greenwood. The high school’s graduation rate was 91%, about 1 point above the state, alongside chronic absenteeism of 35%, compared with 24% statewide.
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