Williamsville CUSD 15

The three schools in Williamsville CUSD 15 serve 1,458 students from prekindergarten through grade 12: Sherman Elementary School serves PK–4, Williamsville Junior High School serves grades 5–8, and Williamsville High School serves grades 9–12. The schools’ supplied 2025–2026 proficiency results are all above their corresponding state rates, though the size of the lead varies. The clearest overall finding is that every supplied result at all three schools exceeded its matching state rate.

The junior high leads the two IAR schools in all-grades ELA, with 82% proficient versus 78% at Sherman—a 4-point difference—and is 25 points above the state. Sherman leads in all-grades math, at 71% versus 61% at the junior high, a 10-point difference; Sherman is 32 points above the state, compared with 22 points for the junior high. At the high school, every listed ACT or PreACT result is above the state: advantages range from 4 points in 10th-grade math to 26 points in 11th-grade ELA. SchoolDigger gives the district five stars and ranks it 65th of 738 districts, in the 91st percentile; it places Sherman and the junior high at the 90th percentile and the high school at the 88th in their respective school rankings.

Recent changes are mixed: Sherman’s ELA and math proficiency each rose 6 points, while junior-high ELA dipped 1 point and math rose 2. At the high school, 9th-grade science fell 12 points, while 10th-grade ELA rose 7; 10th-grade math fell 3. For context, 2024–2025 free/reduced lunch eligible rates were 13% at Sherman, 18% at the junior high, and 18% at the high school; student-teacher ratios were 15.1, 14.3, and 14.0, respectively. The high school also pairs 99% graduation with 12% chronic absenteeism, higher than Sherman’s 4% and the junior high’s 6%, a difference families may want to consider.