Summary:
Greendell, New Jersey, has one listed school, Green Hills School, serving prekindergarten through grade 8 with 414 students. In 2025–2026, its average proficiency was above New Jersey’s in both ELA (62% versus 51%, an 11-point advantage) and math (49% versus 40%, an 8-point advantage). There is no school-to-school comparison in this one-school list, and the grade-level results vary substantially. The most important takeaway is that above-state averages do not mean students see equally strong results in every grade.
Among the strongest results, Algebra I proficiency was 95%, compared with 40% statewide, a 55-point advantage; the eighth-grade Algebra I comparison was 95% versus 75%, a 21-point advantage. Fifth-grade ELA also stood out at 79%, 27 points above the state. At the lower end, eighth-grade math was 17%, 6 points below the state’s 23%, and fifth-grade science was 21%, 6 points below the state’s 27%. The spread across grades was wide: ELA ranged from 42% in grade 4 to 79% in grade 5, while math ranged from 17% in grade 8 to 70% in grade 7.
Results over time are mixed: the ELA advantage over the state stayed roughly steady, moving from 10.7 to 11.3 percentage points between 2024–2025 and 2025–2026, while the math advantage narrowed from 11 to 8 points. Science scores fell in both grades reported: fifth-grade proficiency dropped from 36% to 21%, and eighth-grade proficiency from 35% to 26%. SchoolDigger’s ranking also declined, from the 70th percentile in 2023–2024 to the 64th in 2024–2025 and 56th in 2025–2026; it listed the school at 3 stars in all three years. As context, the 2024–2025 student-teacher ratio was 9.5, and 11% of students were free/reduced lunch eligible. Chronic absenteeism was 10%, 5 percentage points below the state’s 14%.
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