Summary:
Hanover, Illinois, has one listed high school, River Ridge High School, which serves grades 9–12 and enrolls 128 students, so its results are best viewed against the state rather than another local school. The most important finding is that River Ridge is above the state in six of nine tested subject-and-grade comparisons, matches it in one, and is below it in two.
River Ridge’s strongest comparisons are in grade 11 ACT Mathematics, where 52% met the standard versus 40% statewide, and grade 9 PreACT Secure ELA and Science, where results were 75% versus 62% and 59% versus 47%, respectively. Its clearest weakness is grade 10 PreACT Secure ELA: 42% compared with 54% statewide, a gap of 11 points. Grade 10 Science is also below the state, at 46% versus 48%, while Mathematics matches at 36%. Because River Ridge is Hanover’s only listed high school, there is no local top-to-bottom school comparison.
Results have improved overall compared with the prior year, but the pattern varies by grade: the average across the nine comparisons rose 4 points, while all three grade 11 results increased; all three grade 10 results declined or were nearly unchanged, and grade 9 Science fell 8 points even as grade 9 ELA and Mathematics rose. SchoolDigger places River Ridge at the 72nd percentile in 2025–2026, up 2 points from the prior year but 7 points below its 2023–2024 percentile. Other context: the student-teacher ratio was 8.4 in 2024–2025, and 37% of students were free/reduced lunch eligible that year. The 2025–2026 graduation rate was 94%, 4 points above the state; chronic absenteeism was 16%, 8 points below it.
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