it looks like you have to pay to retake the test. But that they offer some sort of insurance that perhaps costs less to give you one additional reduced rate attempt to pass. Also it appears that you might hit a continue button after finishing a training module and find yourself on a path that wasnt documented at the link shared by greg. in my case i finished a modeling module in a modeling path and found myself in a security module path. but on the link it seemed like the next path would be visualizations. and security isnt on the list at that link. this worries me because i'm losing confidence that the correct modules for pl300 study arent even completely documented .