redsnail is the undisputed master of this. search for some of her many posts and all will become clear.
Whatever you do don't waste your money on a second-hand JAA theory course CDROM from Ebay or whatever else it is you've found, cos it won't do you any good at all. You can't just sign up to sit the JAA ATPL exams, you have to first meet the requirement of you being enrolled on a course at a JAA approved groundschool and completing the minimum 650 hour course of study for the ATPL writtens and getting a certificate to that effect, before you're even allowed to take the exams.