How does Chaparral Middle compare to other middle schools in Diamond Bar?

Chaparral Middle has a SchoolScope composite score of 74.0/100, placing it at the 99th percentile statewide. 58% of students exceed standard, with a total of 2,662 students tested across grades and subjects.

What percentage of students exceed standards at Chaparral Middle?

58.3% of students at Chaparral Middle exceed the state standard on CAASPP assessments, while 81.6% 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 Chaparral Middle?

3.2% of students at Chaparral Middle 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.

Chaparral Middle

Q: Is Chaparral Middle improving or declining?

Chaparral Middle's proficiency rate increases by 1.6 percentage points from Grade 6 to grade 8 growth, suggesting the school is adding value over time.

Middle School

Walnut Valley Unified Diamond BarLos Angeles County91765

Composite Score

out of 100

State Percentile

of middle schools

State Rank

of California middle schools

School overview

Enrollment

1,204 students

Student-Teacher Ratio

27:1

Free/Reduced Lunch

25%

Teachers

45 full-time

Dashboard indicators

ELA Year-over-Year

Maintained

-0.9 pts DFS change

Math Year-over-Year

Increased

+12.0 pts DFS change

EL Proficiency (ELPAC)

40.2%

English learners at Level 4 (Well Developed) · 122 tested

Data source: California School Dashboard 2025, ELPAC 2024

Student demographics

Hispanic15.9%

White4.7%

Asian70.3%

Black1.2%

Other8.0%

Performance breakdown

Performance breakdown for Chaparral Middle
Category	Percentage
Exceeded Standard	58.3%
Met Standard	23.3%
Below Standard	18.4%

What other rankings don't show you

Most rating sites report "82% proficient" for Chaparral Middle and stop there. Here's what that number hides:

58.3% of students exceeded standard while 23.3% merely met it. That exceeded rate is 41.0 points above the state average of 17.3%. That's 9.3 points above the Walnut Valley Unified district average of 49.0%. Compared to the 2 nearby schools within ~3 miles, this exceeded rate is 9.0 points higher (vs 49.4% average). The gap between "met" and "exceeded" is the difference between a school that clears the bar and one that raises it.

Students here improve by 1.6 percentage points from Grade 6 to grade 8 growth, suggesting the school is adding value beyond what students arrive with.

California's Dashboard shows ELA performance maintained and Math increased year-over-year. 40.2% of English learners reached Level 4 (Well Developed) on ELPAC.

Chronic absenteeism is 3.2%, better than the state average of 19.3%.

Why the exceeded vs. met split matters →

Key metrics

% Exceeded Standard

58.3%

Students scoring above proficient

% Met or Above

81.6%

Students meeting standard

Growth (G6→G8)

+1.6pp

Change in proficiency rate

Chronic Absenteeism

3.2%

Students missing 10%+ of days

Suspension Rate

0.3%

Students suspended at least once

Total Tested

2,662

Across all grades & subjects

Grade trajectory

ELA Trajectory

G6 → G7 → G8

Math Trajectory

G6 → G7 → G8

ELA scores by grade

Grade	Tested	Exceeded	Met	Nearly Met	Not Met	Met+Above
6th	463	46.2%	33.0%	12.1%	8.6%	79.3%
7th	436	64.2%	24.3%	6.9%	4.6%	88.5%
8th	413	47.9%	32.9%	9.7%	9.4%	80.9%

Math scores by grade

Grade	Tested	Exceeded	Met	Nearly Met	Not Met	Met+Above
6th	478	58.2%	18.4%	14.8%	8.6%	76.6%
7th	451	69.0%	17.3%	9.3%	4.4%	86.3%
8th	421	64.4%	13.8%	11.9%	10.0%	78.2%

K-12 Feeder PathBoundary data

Elementary

Maple Hill Elementary

76.899th pctile

Zoned

Quail Summit Elementary

72.497th pctile

Zoned

Evergreen Elementary

67.091st pctile

Zoned

▼

Middle

Chaparral Middle

74.099th pctile

This school

▼

High School

Diamond Bar High

79.197th pctile

Zoned

Feeder patterns derived from 2015-16 NCES attendance boundary data. Boundaries may have changed. Contact your school district for current information.