CourseCode Definitions:
Format: CY#-d
Where:
CY: CaiYi class (enrichment); e.g. CY2-2: music, afternoon class
#: Category: 1 art, 2 music, 3 sport, 4 math, 5 chess, 6 English
d: Odd: morning class, e.g. CY2-3; Even: afternoon class, e.g. CY1-2, CY2-4