High Schools in Johnsburg CUSD 12

Johnsburg High School is the only high school in Johnsburg CUSD 12, serving grades 9–12 with 502 students. Its latest results show a clear grade-level divide: all three grade 10 and all three grade 11 results were above state levels, while all three grade 9 results were below them. The most important finding for families is that grade 9 is the school’s clearest area of concern, particularly in science.

The school’s strongest latest result was grade 11 ACT science: 60% proficient, 12 percentage points above the state. Its weakest was grade 9 PreACT science, at 35%, 12 points below the state; grade 9 ELA was 5 points below state levels and math was 2 points below. Across the nine subject-and-grade results, six were above state levels. Other indicators are favorable against the state: the graduation rate was 94% compared with 90% statewide, and chronic absenteeism was 17% versus 24% statewide. Chronic absenteeism was, however, 4 points higher than the district’s 13%.

Results declined overall from 2024–2025: the average across the nine results fell by 4 points, from 54% to 50%, while the school’s average advantage over the state narrowed from 6 points to 3. Grade 9 science drove much of the concern, dropping 19 points, from 54% to 35%; grade 11 ACT science was a notable exception, rising 6 points, from 53% to 60%. SchoolDigger’s statewide percentile ranking rose from the 70th percentile in 2023–2024 to the 80th in 2024–2025, then declined to the 66th in 2025–2026. As additional context, 32% of students were free/reduced lunch eligible in 2024–2025, and the student-teacher ratio that year was 13.2:1.