Brian Monetti, I work at Noodle Education!
The Noodle Ratings describe how the school performs compared to other schools in the state on standardized tests. The schools which score 5/5 are in the 80th to 100th percentile for state standardized tests, 4/5 are in the 60th to 80th percentile, and so on to 1/5 which score in the 0th - 20th percentile. More info can be found here: https://www.noodle.com/report-cards/k12