Schools in Arizona: 10 best, worst schools in Maricopa County

Newly released preliminary data from the State Board of Education grades high schools and elementary schools on their performance. 

RELATED: How'd your school do? Search AZ school grades database

From this information, ABC15 broke down the 10 highest and lowest graded elementary and high schools in Maricopa County. (These grades are subject to change once the finalized grades are released.)

Highest Graded Valley High Schools:

1. University High School- 103%
2. Phoenix Union Bioscience High School- 100%
3. Gilbert Classical Academy High School- 100%
4. Arizona Agribusiness & Equine Center - Estrella- 94%
5. Thunderbird High School- 91%
6. Sunnyslope High School- 91%
7. Moon Valley High School- 91%
8. Apollo High School- 90%
9. Greenway High School- 90%
10. Franklin Police and Fire High School- 89% 

Lowest Graded Valley High Schools:

1. Girls Leadership Academy of Arizona- 24%
2. Phoenix Collegiate Academy High School- 42%
3. South Mountain High School- 56%
4. Westwood High School- 56%
5. Tempe High School- 57%
6. Academy with Community Partners- 58%
7. Alhambra High School- 58%
8. Maryvale High School- 59%
9. Dysart High School- 60%
10. Mesa High School- 60%

Highest Graded Valley Elementary Schools:

1. ASU Preparatory Academy - Polytechnic Elementary- 102%
2. Great Hearts Academies - Archway Scottsdale- 100%
3. Copper Canyon Elementary School- 100%
4. Kiva Elementary School- 99%
5. Crown Charter School- 99%
6. Kyrene de la Mirada School- 99%
7. Sunset School- 99%
8. Cochise Elementary School- 98%
9. Horizon Honors Elementary School- 98%
10. Laguna Elementary School- 98%

Lowest Graded Valley Elementary Schools:

1. Amy L. Houston Academy- 28%
2. Step Up School- 38%
3. Patriot Academy- 39%
4. Arthur M Hamilton School- 42%
5. Cesar E Chavez Elementary School- 43%
6. AIM Higher College Prep Academy- 43%
7. Phoenix Collegiate Academy Charter School- 44%
8. Bradley Academy of Excellence- 45%
9. Children First Leadership Academy- 46%
10. Painted Desert Montessori, LLC- 46%

A total of 116 elementary schools and 89 high schools in Maricopa County were either not rated or "under review" and were not given detailed grade breakdowns.

Want to see a breakdown of the grades for both elementary and high schools in the county? Take a look at the chart below.

The grades were calculated on a point system that includes categories like "Proficiency," "English Language Learners," "Growth," and "Acceleration/Readiness." Percents listed above are rounded for simplicity.