How does Armstrong Elementary compare to other elementary schools in Diamond Bar?

Armstrong Elementary has a SchoolScope composite score of 47.5/100, placing it at the 61st percentile statewide. 18% of students exceed standard, with a total of 464 students tested across grades and subjects.

What percentage of students exceed standards at Armstrong Elementary?

18.1% of students at Armstrong Elementary exceed the state standard on CAASPP assessments, while 39.2% meet or exceed it. The gap between these two numbers reveals whether the school pushes students beyond basic proficiency.

Is Armstrong Elementary improving or declining?

Armstrong Elementary's proficiency rate increases by 14.1 percentage points from grade 3 to grade 5, suggesting the school is adding value over time.

What is the chronic absenteeism rate at Armstrong Elementary?

21.3% of students at Armstrong Elementary 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.

Armstrong Elementary

Pomona Unified Diamond Bar Los Angeles County 91765

Composite Score

out of 100

State Percentile

of elementary schools

State Rank

464 students tested

School overview

Enrollment

249 students

Student-Teacher Ratio

21:1

Free/Reduced Lunch

69%

Teachers

12 full-time

Student demographics

Hispanic 60.6%

White 9.6%

Asian 7.2%

Black 5.6%

Other 16.9%

Performance breakdown

Performance breakdown for Armstrong Elementary
Category	Percentage
Exceeded Standard	18.1%
Met Standard	21.1%
Below Standard	60.8%

Exceeded

18.1%

Met

21.1%

Below

60.8%

What other rankings don't show you

Most rating sites report "39% proficient" for Armstrong Elementary and stop there. Here's what that number hides:

18.1% of students exceeded standard while 21.1% merely met it. That exceeded rate is 2.9 points below the state average of 21.0%. That's 6.0 points above the Pomona Unified district average of 12.1%. The 9 nearby schools within ~3 miles average 35.5% exceeded — 17.4 points higher. 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 14.1 percentage points from grade 3 to grade 5, suggesting the school is adding value beyond what students arrive with.

Chronic absenteeism is 21.3%, above the state average of 18.7%.