Free American Naturalization self-tests are available on the U.S. Citizenship and Immigration Services website. Four practice tests are offered for the requisite civics test and may be used to test knowledge and understanding of U.S. history and government. USCIS offers online flash cards, audio files, videos and vocabulary lists to help prospective citizens prepare, and it offers printed materials through a government bookstore.
Materials for the English section of the interview, which is composed of speaking, reading and writing sections, are also available on the USCIS website. These interactive activities test users on words, phrases and commands found in the English testing portion of the naturalization interview.
On the civics test, 10 of the 100 available questions are asked, and six correct answers are required to pass. Applicants may take both the civics and English tests twice during a single application period, according to USCIS. Failure to pass the United States naturalization interview during the first attempt requires a retest of the failed portion, which is scheduled between 60 and 90 days from the original interview. Repeated failure to pass the tests results in the need to process a new application for naturalization. Not all potential citizens are required to take these tests.