| Index | Gardner | Massachusetts | National |
| Average Test Scores | 38% | 52% | 48% |
| Student/Teacher ratio | 15:1 | 14:1 | 16:1 |
| Total public schools | 6 | 1,167 | 79,221 |
| Total private schools | 3 | 508 | 24,874 |
| Total post-secondary schools | 1 | 193 | 7,963 |
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| Index | Gardner | Massachusetts | National |
| Completed 8th grade | 81.4% | 88.3% | 84.3% |
| Completed high school | 79.4% | 87.2% | 83.0% |
| Completed some college | 49.4% | 65.0% | 59.4% |
| Completed associate degree | 28.6% | 49.0% | 38.5% |
| Completed bachelors | 17.7% | 41.2% | 30.3% |
| Completed masters | 6.6% | 18.2% | 11.5% |
| Completed professional degree | 1.1% | 5.4% | 3.3% |
| Completed doctorate | 0.3% | 2.6% | 1.3% |
There are a total of 6 public schools, 3 private schools and 1 post-secondary schools in Gardner. Using the proficiency score averages, the average test scores for Gardner, MA schools is 38%. The average student to teacher ratio is 15:1. In Gardner, MA, an average of 81.4% of students have completed 8th grade and an average of 79.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Rutland, MA | 1,749 | 62% | 29.7% |
| Lunenburg, MA | 1,593 | 59% | 23.3% |
| Townsend, MA | 1,276 | 57% | 19.4% |
| South Ashburnham, MA | 883 | 55% | 14.1% |
| Barre, MA | 950 | 50% | 4.2% |
| Gardner, MA | 20,605 | 38% | 20.6% |
| City | Population | Avg. Test Scores | National Avg. |
| Fernley, NV | 20,616 | 40% | 16.1% |
| Merrick, NY | 20,594 | 76% | 58.6% |
| Ferguson, MO | 20,631 | 17% | 65.4% |
| Marquette, MI | 20,631 | 50% | 4.5% |
| Clemmons, NC | 20,574 | 66% | 38.0% |
| Gardner, MA | 20,605 | 38% | 20.6% |
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