I've used them three times in the last year and I've gotten no less than a 93% on any of my tests, including one 100%. Their method is simple...they have a relationship with the FAA! Ever since the FAA won the argument to maintain proprietary ownership of the entire question bank, the feds are able to sell the information. I think that much of the relationship is self explanatory. The rest of the story is that some some test prep programs have you studying the ENTIRE database for your particular test. Sheppard Air only includes the current segment of questions. Every so often, I'm guessing quarterly, the FAA establishes the current question bank. They mix it up to keep applicants on their toes. Somehow, Sheppard Air is able to update the information on a daily basis. If the question is rephrased or new "incorrect" choices are added to the test, their software updates where most others don't. Don't take short-cuts with the software. Study the way they tell you.