| Index | Garden City South | New York | National |
| Average Test Scores | n/a | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | n/a | 4,060 | 79,221 |
| Total private schools | n/a | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Garden City South | New York | National |
| Completed 8th grade | 86.3% | 83.5% | 84.3% |
| Completed high school | 86.3% | 82.1% | 83.0% |
| Completed some college | 64.6% | 59.5% | 59.4% |
| Completed associate degree | 51.3% | 43.4% | 38.5% |
| Completed bachelors | 41.8% | 34.7% | 30.3% |
| Completed masters | 19.3% | 15.1% | 11.5% |
| Completed professional degree | 4.4% | 4.2% | 3.3% |
| Completed doctorate | 0.7% | 1.5% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Garden City South. Using the proficiency score averages, the average test scores for Garden City South, NY schools is n/a. The average student to teacher ratio is n/a. In Garden City South, NY, an average of 86.3% of students have completed 8th grade and an average of 86.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Sea Cliff, NY | 5,045 | 92% | 91.7% |
| Cedarhurst, NY | 6,642 | 91% | 89.6% |
| Old Westbury, NY | 4,618 | 91% | 88.5% |
| Jericho, NY | 13,928 | 90% | 87.1% |
| Old Bethpage, NY | 5,450 | 90% | 86.5% |
| Garden City South, NY | 4,254 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Hokes Bluff, AL | 4,253 | 45% | 7.3% |
| Taylor, AZ | 4,255 | 56% | 16.7% |
| Mount Pleasant, PA | 4,255 | 55% | 14.1% |
| High Ridge, MO | 4,257 | 47% | 2.6% |
| Morgan, UT | 4,259 | 48% | = 100 |
| Garden City South, NY | 4,254 | n/a |
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