FAA Exams
I just did 3 exams over in the US. Commercial, Instrument and ATP (all helicopter). Did and passed the first 2 using aviationexam.com. It was very useful due to being on my IPhone and consequently allowed me to study anywhere any time. However, it was suggested I do the final one (ATP) using Sheppard. After using Sheppard, I would not go with any other system. They guarantee at least a 90% pass, and, sure enough, after only 4 or 5 days of study, I passed with 98%. As stated before, it is necessary to actually know the subjects because the oral before any check ride is usually fairly in depth.