Civics Test Study Tools is an official application of USCIS, designed to help you study for the civics test portion of the naturalization interview.
Download the USCIS Civics Test Study Tools app for Apple: https://itunes.apple.com/us/app/uscis-civics-test-study-tools/id1216824613?mt=8&ign-mpt=uo%3D4
Download the USCIS Civics Test Study Tools app for Android: https://play.google.com/store/apps/details?id=com.myuscismobileapp