Is cs optec computer course is compulsory?

hello friends, this december(2011) i will take CS Executive exams, now iam in confusion that  is CS aptec computer course compulsory for taking december exams, because my friends are already wrote previous executive exams without doing aptec course,my friends told me that you can do that course after your exams,so i also plan that i will take aptec exams on after executive exams, so please suggest me when i will take aptec course whether before exams or after exams?thank you waiting for yout valuable comments