Chsd 128

CHSD 128 has two public high schools serving grades 9–12: Libertyville High School and Vernon Hills High School. Both schools’ 2025–26 proficiency results were strong compared with Illinois: each scored above the state on all nine reported ACT and PreACT measures, with school results ranging from 23.4 to 40.2 percentage points above the corresponding state rates.

Libertyville leads overall, scoring higher than Vernon Hills on eight of the nine measures. Its largest lead was 9 points in grade 11 ACT Science (82% versus 73%). Vernon Hills’ standout was grade 10 PreACT Science, where it scored 81.3%, just ahead of Libertyville’s 80.8%. SchoolDigger gives both schools five stars and ranks Libertyville 15th and Vernon Hills 21st out of 620 Illinois schools. The gap varies by subject: the schools’ average scores were 6 points apart in ELA, 4 in Math and 5 in Science.

Results shifted differently by school and test between 2024–25 and 2025–26: Libertyville improved on five measures, declined on three and was unchanged on one; Vernon Hills improved on four and declined on five. Across the nine tests, the average school score rose about 1 point, while the state average edged down by less than 1 point. Other measures offer context, not an explanation for the score differences: Libertyville’s student–teacher ratio was 13.5 compared with 12.3 at Vernon Hills (2024–25), and free/reduced lunch eligibility was 5% versus 13% (2021–22). Graduation rates were nearly identical at about 95% at both schools, compared with 90% statewide; chronic absenteeism was 14% at Libertyville and 18% at Vernon Hills, below the state’s 24%.