I recently began to test the EPPP study cards for IPhone. Version 1.3 is priced at $29.99 and the typos have been cleaned up. Overall, I find the cards informative and easy to use. Just select the area you want to review and go through the questions. The software can keep track of your errors thus allowing you to see just what area you need to focus on. It's a great little tool and wonderful when you are on the road or at the airport. You may also purchase individual modules for a fraction of the price.