Summary:
Mendota, Illinois, has four schools serving kindergarten through grade 12: Blackstone Elementary School (K–1), Lincoln Elementary School (grades 2–4), Northbrook School (grades 5–8), and Mendota Township High School (grades 9–12). Test results are available for the other three schools, but none are supplied for Blackstone; year-to-year results compare different student cohorts. The central takeaway is that results vary substantially by subject and grade, so no single school stands out as strongest across the board.
Northbrook stands out in ELA: its 2025–2026 all-grades result was 57%, about 1 point above the state, and eighth-grade students were 2 points above the state. Its clearest weakness is math, where the all-grades result was 22%, 17 points below the state. Lincoln has the stronger all-grades math result of the two elementary and middle schools with IAR scores—38%, 2 points below the state and 10 points above its district, Mendota CCSD 289—but its ELA result was 38%, 18 points below the state. At the high school, grade 9 PreACT ELA was a bright spot at 65%, 4 points above the state; grade 10 results were below the state in all three reported subjects.
Recent results show modest ELA gains at both Northbrook and Lincoln, but their average ELA gap to the state widened; Northbrook math fell 6 points while Lincoln math rose 1 point. SchoolDigger’s 2025–2026 rankings place Northbrook at the 35th percentile, Lincoln at the 23rd, and Mendota Township High School at the 40th. As context, free/reduced lunch eligible rates in 2024–2025 ranged from 56% at the high school to 62% at Blackstone, while student–teacher ratios ranged from 11.5 at Blackstone to 13.8 at Northbrook. Chronic absenteeism was below the state rate at all four schools, ranging from 15% to 17%, compared with 24% statewide.
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