Summary:
ZIP code 57262 has one high school, Sisseton High School - 01, serving grades 9–12 with 304 students. Its strongest subject relative to state results is ELA, while math is the clearest concern: on the 2025–2026 11th-grade ACT, ELA was 37% (11 points below the state) and math was 13% (21 points below); on 2024–2025 all-grades Smarter Balanced, ELA was 45% (6 points below) and math was 27% (17 points below). The most important finding is that math had the largest state gap in both reported assessments.
There is no true local top or bottom school because Sisseton High School - 01 is the only high school in the list. Its relative strength is ELA: in Smarter Balanced it scored 10 points above Sisseton School District 54-2, while it was 1 point below the district in math and 3 points below in science. Graduation was 84%, compared with 88% statewide; the dropout rate was 4%, versus 2% statewide and 3% in the district. These comparisons show stronger ELA performance against the district, but weaker math and science results and less favorable graduation and dropout rates than the state.
SchoolDigger’s rankings weakened in percentile terms in the latest year: the school went from the 23rd percentile in both 2023–2024 and 2024–2025 to the 9th percentile in 2025–2026, and its star rating fell from 1 to 0. Its numbered rank improved from 128 of 166 to 118 of 130, but the comparison groups changed. The student–teacher ratio was 14.8 in 2024–2025, and 53% of students were free/reduced lunch eligible that year; these are context, not explanations for results. Because there is only one school listed and each assessment is reported for one year, the data cannot show school-to-school differences or a same-test score trend.
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