Summary:
The high-school group in Seneca Township HSD 160 has one school, Seneca High School, serving grades 9–12 with 378 students. Its student–teacher ratio is 9.9:1, and 32% of students were free/reduced-lunch eligible in 2024–2025. The clearest concern is grade-11 mathematics: 30% of Seneca students met the proficiency measure, versus 40% statewide, a 10-point shortfall.
Seneca High School is both the highest- and lowest-performing school in this group by default, so there is no school-to-school leader or laggard. Compared with the state, Seneca was above in six of nine current subject-and-grade comparisons. Its strongest relative results were ELA: grade-10 PreACT proficiency was 64% versus 54% statewide, and grade-11 ACT was 60% versus 50%. Science was also above the state in grades 10 and 11 by about 6 points, while grade-9 results were close to state levels across subjects. Mathematics is the main exception: grade-10 proficiency was 3 points below the state, while grade 9 was about even. Because the group has only one school, it cannot show how Seneca compares with other local schools.
Grade-11 ACT results improved relative to the state from 2024–2025 to 2025–2026: Seneca’s ELA advantage grew by 8 points, its math shortfall narrowed by 9 points, and science moved from 6 points below to 6 points above the state. Grade-9 PreACT advantages, by contrast, narrowed sharply; science shifted from above the state to about even. SchoolDigger ranked Seneca at the 65th percentile with 3 stars in 2025–2026, down from the 70th percentile the prior year. Other context is favorable: graduation was 93%, 4 points above the state, and chronic absenteeism was 15%, 8 points below it.
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