When a Legal Permanent Resident applies for naturalization to obtain U.S. Citizen status, they must show that they are familiar with the English language and American Civics (unless they qualify for an exemption or waiver). During the naturalization interview, before an immigration official, they must correctly answer at least 6 questions from the civics test to pass the test.
The USCIS publishes several study tools to help you prepare for the test. Please see the link below for a list of the 100 questions that may appear on the test. The USCIS site has links to flashcards, audio, and other study materials that may assist you.
There are a limited number of instances when a Legal Permanent Resident may be able to take the test in their native language and it depends on how long you have resided in the U.S. and when you became a legal permanent resident.
Study Materials for the English Test – USCIS website