As a person who didn't actually pay attention or read any drivers Ed material before taking the written test, I'd say this app is pretty useful. Some of the questions that are asked on this app are phrased the same way on the written test. I studied, using this app, for about 20-30 minutes and still managed to pass. Along with this app, I studied on another website I found on Google for about 20-30 minutes as well, but I feel like if you just use this app, you'll be fine. This app was able to prepare me more than the website I used, so thanks for making this application :) it really helped. I highly recommend it to anyone who's going to take a written test but haven't practiced much.