“ PTC USA is the online joint for aspiring Personal Trainers & Professionals. Full of information and useful resources about Personal Training Certification and valuable tools that will help you propel your business as a Certified Personal Trainer.
I would recommend you buy the practice exam books, it's three of them including a dvd which has further videos explaining stuff from the workbooks.That is really all you need as far as preparation for the cpt exam goes. Good luck!