Summary:
Zip code 62664 has three schools in Illini Central CUSD 189, serving kindergarten through grade 12: Illini Central Grade School (K–5), Illini Central Middle School (6–8), and Illini Central High School (9–12). Results vary by school, grade, and subject: the middle school leads in IAR English language arts (ELA), while the grade school leads in IAR math. The most important takeaway is that neither IAR school is strong across both subjects: both are below the state in all-grades math.
The middle school stands out in all-grades ELA, with 56.6% proficient versus 39% at the grade school; the state result was 56.3%, putting the middle school just 0.3 points above it. In math, the grade school leads, at 32% versus 25% at the middle school, but both fall short of the 40% state result—by 7 and 14 points, respectively. At the high school, 11th-grade ACT results were above state results in ELA and science by 5 and 4 points, but below in math by 6 points. Its 9th- and 10th-grade PreACT results, in contrast, were below state results in every reported subject.
Recent trends are mixed: the grade school’s ELA result rose 9 points from 2024–2025 to 2025–2026, while its math result fell 4 points; at the middle school, ELA rose 3 points and math fell 2. The high school’s 11th-grade ACT results improved in all three subjects, moving above the state in ELA and science. SchoolDigger’s latest statewide rankings place the grade, middle, and high schools at the 24th, 32nd, and 39th percentiles; the high school improved 10 percentile points over two years, while the other two fell 15 and 13. For 2024–2025, student-teacher ratios were 10.1 at the grade school, 11.1 at the middle school, and 8.2 at the high school; free/reduced lunch eligible shares that year were 58%, 45%, and 38%, respectively—contextual differences that do not by themselves explain achievement.
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