ipas,
You say in your first post that your dream is to be an airline pilot. With this in mind you should be focusing on the 14 ATPL theory subjects rather than the CPL theory exams. From what I understand the CPL subjects closely follow the ATPL subjects, however, if you want to do the IR you need to do another 7 or 8 subjects, this is why most follow the ATPL theory route.
Check out this thread for a much better explanation!
CPL Theory/ATPL Theory