How does Mills High compare to other high schools in Millbrae?

Mills High has a SchoolScope composite score of 77.6/100, placing it at the 97th percentile statewide. 45% of students exceed standard, with a total of 540 students tested across grades and subjects.

What percentage of students exceed standards at Mills High?

45.4% of students at Mills High exceed the state standard on CAASPP assessments, while 72.6% meet or exceed it. The gap between these two numbers reveals whether the school pushes students beyond basic proficiency.

What is the chronic absenteeism rate at Mills High?

8.2% of students at Mills High are chronically absent (missing 10% or more of school days). This metric reflects school culture and family engagement, and is weighted at 15% in our composite score.

Mills High

High School

San Mateo Union High MillbraeSan Mateo County94030

📍 400 Murchison Drive

Composite Score

out of 100

State Percentile

of high schools

State Rank

of 1,739 California high schools

💪

Strong All-Around

Strong across every dimension we measure — academics, growth, culture, and engagement.

Composite scores are SchoolScope's analysis of public data from the California Dept. of Education (CAASPP, chronic absenteeism, suspension rates). They are not official CDE ratings and should not be the sole basis for school decisions. See methodology.

School overview

Enrollment

1,119 students

Student-Teacher Ratio

20:1

Free/Reduced Lunch

17%

Teachers

57 full-time

College & career readiness

Graduation Rate

97.1%

AP Exam Prepared

83.4%

A-G Completion

66.7%

College-Going Rate

92.5%

Data source: California Department of Education — ACGR, CCI, CGR reports

Dashboard indicators

ELA Year-over-Year

Increased Significantly

+35.6 pts DFS change

Math Year-over-Year

Increased Significantly

+35.8 pts DFS change

EL Proficiency (ELPAC)

39.0%

English learners at Level 4 (Well Developed) · 41 tested

Data source: California School Dashboard 2025, ELPAC 2024

Student demographics

Hispanic19.6%

White11.6%

Asian49.8%

Black0.2%

Other18.9%

Performance breakdown

Performance breakdown for Mills High
Category	Percentage
Exceeded Standard	45.4%
Met Standard	27.2%
Below Standard	27.4%

What other rankings don't show you

Most rating sites report "73% proficient" for Mills High and stop there. Here's what that number hides:

45.4% of students exceeded standard while 27.2% met it. That exceeded rate is 29.9 points above the state average of 15.5%. That's 13.3 points above the San Mateo Union High district average of 32.0%. Compared to the 2 nearby schools within ~3 miles, this exceeded rate is 35.3 points higher (vs 10.1% average). The gap between "met" and "exceeded" can reveal how much a school's curriculum challenges students beyond proficiency.

The graduation rate is 97.1% — above the state target. 66.7% of students complete A-G requirements for UC/CSU eligibility — a strong college readiness signal. 92.5% of graduates go on to college within a year.

Chronic absenteeism is 8.2%, better than the state average of 34.0%.

Why the exceeded vs. met split matters →