Summary:
Schools in zip code 60936 include three schools in Gibson City-Melvin-Sibley CUSD 5, serving students from prekindergarten through grade 12 and enrolling 975 students altogether. GCMS Elementary School serves PK–5, GCMS Middle School serves grades 6–8, and GCMS High School serves grades 9–12. Results are not uniformly strong across every grade and subject, but the clearest standout is the middle school’s ELA and grade 8 science performance and the high school’s grade 11 ACT results, each about 20 percentage points above state results.
The middle and high schools lead on several reported assessments, while elementary results vary notably by grade. Middle-school all-grades ELA proficiency was 76%, compared with 56% statewide, and grade 8 science was 72% versus 52%. At the high school, grade 11 ACT proficiency was 70% in ELA, 59% in math and 68% in science—about 19 to 20 points above state results in each subject. Elementary strengths include grade 3 math at 62% (13 points above state) and grade 5 science at 64% (17 points above). Its weaker pockets are grade 4 math at 39% (3 points below state) and grade 5 math at 28% (8 points below). Grade 10 PreACT math and science were nearly even with, but just below, state results.
Recent changes are mixed, with especially large gains in the high school’s grade 11 ACT results from 2024–25 to 2025–26: 15 points in ELA, 20 in math and 24 in science. The two schools with IAR results also improved their average math scores, while their average ELA advantage over the state narrowed. SchoolDigger’s 2025–26 rankings place the high school at the 79th percentile, the middle school at the 70th and the elementary school at the 56th; these rankings are separate from test scores. Student-teacher ratios are relatively close, from 10.1 at the middle school to 12.0 at the high school. In 2024–25, free/reduced lunch eligible shares were 50% at elementary, 39% at middle and 36% at high school; these are context about the schools, not an explanation for their results.
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