| Index | Arnold | California | National |
| Average Test Scores | 50% | 43% | 48% |
| Student/Teacher ratio | 3:1 | 20:1 | 16:1 |
| Total public schools | 1 | 8,308 | 79,221 |
| Total private schools | n/a | 3,438 | 24,874 |
| Total post-secondary schools | n/a | 1,085 | 7,963 |
| Index | Arnold | California | National |
| Completed 8th grade | 89.4% | 81.1% | 84.3% |
| Completed high school | 88.8% | 79.8% | 83.0% |
| Completed some college | 67.3% | 61.5% | 59.4% |
| Completed associate degree | 42.8% | 39.8% | 38.5% |
| Completed bachelors | 30.1% | 32.0% | 30.3% |
| Completed masters | 9.5% | 11.9% | 11.5% |
| Completed professional degree | 2.5% | 3.9% | 3.3% |
| Completed doctorate | 1.3% | 1.6% | 1.3% |
There are a total of 1 public schools, n/a private schools and n/a post-secondary schools in Arnold. Using the proficiency score averages, the average test scores for Arnold, CA schools is 50%. The average student to teacher ratio is 3:1. In Arnold, CA, an average of 89.4% of students have completed 8th grade and an average of 88.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Murphys, CA | 1,996 | 57% | 18.8% |
| Avery, CA | 461 | 52% | 8.3% |
| Angels, CA | 3,970 | 49% | 1.8% |
| Twain Harte, CA | 2,593 | 47% | 2.1% |
| Pioneer, CA | 1,263 | 35% | 28.1% |
| Arnold, CA | 2,151 | 50% | 3.1% |
| City | Population | Avg. Test Scores | National Avg. |
| Morrisville, NY | 2,152 | 51% | 5.7% |
| Rainier, OR | 2,152 | 37% | 23.3% |
| Oakland, MD | 2,152 | 38% | 21.7% |
| St. Charles, MI | 2,152 | 40% | 17.7% |
| Delcambre, LA | 2,150 | 89% | 85.4% |
| Arnold, CA | 2,151 | 50% | 3.1% |
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