| 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 | 1,944 | 57% | 18.8% |
| Avery, CA | 444 | 52% | 8.3% |
| Angels, CA | 3,889 | 49% | 1.8% |
| Twain Harte, CA | 2,502 | 47% | 2.1% |
| Pioneer, CA | 1,224 | 35% | 28.1% |
| Arnold, CA | 2,099 | 50% | 3.1% |
| City | Population | Avg. Test Scores | National Avg. |
| Gurdon, AR | 2,099 | 26% | 46.2% |
| Oakland, MD | 2,099 | 38% | 21.7% |
| Slater-Marietta, SC | 2,098 | 52% | 8.3% |
| Richgrove, CA | 2,098 | 17% | 65.6% |
| Sturbridge, MA | 2,101 | 55% | 14.6% |
| Arnold, CA | 2,099 | 50% | 3.1% |
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