| Index | Grayslake | Illinois | National |
| Average Test Scores | 52% | 33% | 48% |
| Student/Teacher ratio | 20:1 | 18:1 | 16:1 |
| Total public schools | 7 | 3,938 | 79,221 |
| Total private schools | 5 | 1,438 | 24,874 |
| Total post-secondary schools | 1 | 306 | 7,963 |
| Index | Grayslake | Illinois | National |
| Completed 8th grade | 91.3% | 86.2% | 84.3% |
| Completed high school | 90.8% | 84.7% | 83.0% |
| Completed some college | 78.5% | 61.8% | 59.4% |
| Completed associate degree | 57.3% | 40.7% | 38.5% |
| Completed bachelors | 49.4% | 32.9% | 30.3% |
| Completed masters | 18.7% | 12.7% | 11.5% |
| Completed professional degree | 4.4% | 3.4% | 3.3% |
| Completed doctorate | 2.2% | 1.2% | 1.3% |
There are a total of 7 public schools, 5 private schools and 1 post-secondary schools in Grayslake. Using the proficiency score averages, the average test scores for Grayslake, IL schools is 52%. The average student to teacher ratio is 20:1. In Grayslake, IL, an average of 91.3% of students have completed 8th grade and an average of 90.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Lincolnshire, IL | 7,694 | 78% | 62.8% |
| Bannockburn, IL | 1,194 | 77% | 60.4% |
| Deerfield, IL | 19,030 | 77% | 59.4% |
| Northbrook, IL | 33,216 | 72% | 50.7% |
| Libertyville, IL | 20,300 | 71% | 48.7% |
| Grayslake, IL | 20,482 | 52% | 7.7% |
| City | Population | Avg. Test Scores | National Avg. |
| Woodbridge, NJ | 20,500 | 49% | 2.5% |
| Ashland, KY | 20,449 | 47% | 1.3% |
| Suwanee, GA | 20,444 | 76% | 58.4% |
| Marblehead, MA | 20,530 | 64% | 32.3% |
| Palm Valley, FL | 20,540 | 88% | 83.3% |
| Grayslake, IL | 20,482 | 52% | 7.7% |
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