Armstrong Elementary
Elementary Schools (Public)Grades P–6Active
22750 Beaverhead Drive, Diamond Bar, CA 91765-1566
(909) 397-4563
Overall Score (2024-25)
↓ 6.1 ptsvs 2023-2428
out of 100
Below AverageTop 80% statewideData completeness: 100%
Academic Achievement47
CA avg
Academic Growth5
CA avg
Equity6
CA avg
School Climate35
CA avg
Score reflects percentile ranking among same-type schools. How is this calculated?
Test Scores (2024-25)
Percentage of students meeting or exceeding standards on CAASPP/CAST.
English Language Arts47.4%
CA avg 48.8%
Mathematics29.3%
CA avg 34.6%
Science / CAST (2024-25)24.0%
CA avg 32.7%
By Grade
| Grade | ELA % | Math % | Science % | Tested |
|---|---|---|---|---|
| 03 | 37.9% | 37.9% | — | 29 |
| 04 | 40.5% | 18.9% | — | 37 |
| 05 | 68.0% | 36.0% | 24.0% | 25 |
| 06 | 48.0% | 28.0% | — | 25 |
Enrollment & Demographics (2024-25)
251
Total Students
66.9%
Free/Reduced Lunch
10.4%
English Learners
Staff (2024-25)
18.6:1
Pupil-Teacher Ratio
Chronic Absenteeism (2024-25)
↓ 3.3%21.3%
Chronically Absent
258
Students Tracked
Historical Trends
Year-over-year performance data from official CDE records.
Composite Score
ELA Proficiency %
Math Proficiency %
Science / CAST %
Chronic Absenteeism Rate %
Total Enrollment
Parent & Community Reviews
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Data sourced from the California Department of Education. CDS Code: 19649076068787. Academic Year: 2023-24 – 2024-25.