What does CCS mean in StudyIsland?

Since school is around the corner, I want to make sure, I don't forget everything I learned. So, today I logged onto Studyisland, and there were the three subjects of Reading, Writing, and Math. But, on the bottom, there was two other subjects, of English Language Arts and Math, but next to those subjects, there was CCS in the parentheses. Anyone know what the CCS stands for. Thank for any help!