Summary:
Zip code 08550 has one high school, West Windsor-Plainsboro High School South, serving grades 9–12 with 1,627 students. With no other high school in this list, it is the entire local picture rather than one option in a school-to-school comparison. Its 2024–2025 graduation rate was 95%, compared with 89% statewide, and chronic absenteeism was 6%, compared with 14% statewide. The most important finding is the sharp contrast in test results: the school was far above state rates in ELA and Geometry but well below them in Algebra.
The school’s strongest 2025–2026 results were ninth-grade ELA, at 86% versus 51% statewide, and Geometry: 99% for ninth grade and 98% for End of Course, versus 50% and 52% statewide. Eleventh-grade science was also strong at 60%, compared with 29% statewide. Algebra was the clearest weakness: Algebra I proficiency was 13% for End of Course and 14% for ninth grade, versus 40% and 22% statewide. Algebra II was 20% in both categories, compared with 52% and 53% statewide. These differences show why the school’s strong results in some subjects do not tell the whole story.
Results changed unevenly over time. From 2024–2025 to 2025–2026, ninth-grade ELA rose 4 points, while science fell 8 points; Algebra I fell 20 points for End of Course and 20 points for ninth grade, and Algebra II fell 39 points in both categories. Geometry remained near 100% even as state rates declined. SchoolDigger gave the school four stars and ranked it 125th of 434 schools, in the 71st percentile, in 2025–2026; its percentile was 78th in 2023–2024. The student-teacher ratio was 13.7:1, and 9% of students were free/reduced lunch eligible in 2024–2025—context about the school, not an explanation for its results.
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