course codes are like 1A03 or 1LS3 ...
i looked into what u said, there seems to be only one course C200
I dont think u look under the department for science. For say CHEM 1A03: look under department of CHEM, like wise for MATH 1LS3: look under the department of math. I doesn't matter which core u pick, because the textbook is the same any way.