 In 2015-2016 State of Texas Assessments of Academic Readiness (STAAR) results, 69% of students in Castleberry ISD met Level II Satisfactory standards, compared with 77% in Region 11 and 75% in the state of Texas.The average SAT score of the class of 2015 was 1300, and the average ACT score was 19.0.In the 2015-2016 school year, the school district had a total of 4,044 students, ranging from early childhood education and pre-kindergarten through grade 12.