The Naturalization/Citizenship Test has 4 different parts (a Speaking/Understanding Test, a Reading Test, a Writing Test and a Civics Test) and you must pass all 4 parts to become a U.S. citizen. These 4 parts are very different from each other, preparing for each one of them individually is essential.
It is important that you take this test seriously, because failing it could result in being denied naturalization. You will not be able to refer to any resource material during your test.