Cobb County students in 2015 had a composite score of 22.5 on the ACT college entrance exam, slightly higher than the school system's score last year of 22.2, according to results released this week.

Cobb's score is also higher than the state and national averages of 21.0.

Cobb graduates continue to exceed state and national averages in all four subject areas tested: English, Math, Reading and Science. District-wide, the average ACT Score for Reading (23.0) was strongest, followed by English and Science (22.2) and Math (21.9).

Ten of Cobb’s 16 high schools posted average ACT Composite scores higher than the national average.

Similar to the SAT, the ACT is commonly used for college admission and placement. It measures English, math, reading and science proficiency, whereas the SAT measures math, reading and writing.

Scored on a scale of 1 to 36, with 36 being the highest possible score, the ACT is taken voluntary by students throughout the year.