Mundelein Cons HSD 120

Mundelein Cons HSD 120 has one school, Mundelein Cons High School, serving grades 9–12, with 2,282 students. With only one school, families cannot compare campuses within the district; the most useful comparisons are with Illinois results. The key takeaway is that the school is ahead of the state in most reported outcomes, with science and English language arts (ELA) as its clearest academic strengths and current grade 9 and 10 math results as an exception.

Mundelein Cons High School stands out positively against state results, though there is no other local school to place at the top or bottom. In 2025–2026, grade 11 ACT proficiency was 7 percentage points above Illinois in ELA, 4 points above in math, and 7 points above in science. Science also beat the state by 8 points in grade 10 and 4 points in grade 9. Math was below Illinois on both PreACT Secure comparisons: by 2 points in grade 10 and 1 point in grade 9. Graduation was 95%, 5 points above the state; dropout was 1%, 2 points lower; and chronic absenteeism was 17%, 6 points lower.

Results remained stronger than the state overall, but the average advantage across matched tests narrowed from about 5 percentage points in 2024–2025 to 4 points in 2025–2026. The pattern varied by grade: math proficiency rose 8 points in grade 9 but fell 5 points in grade 10, while ELA and science scores declined in several grade-level comparisons. SchoolDigger gives the district 3 stars and ranks it 237 of 738; its percentile rank was 77 in 2023–2024, 78 in 2024–2025, and 71 in 2025–2026. The school’s student–teacher ratio was 15.8:1 in 2024–2025, and 24% of students were free/reduced lunch eligible in 2021–2022, an older figure that provides context rather than an explanation of current results.