Application for Naturalization
Free n 400 practice test with 19 questions and answer explanations. Prepare for the 2026 exam with instant feedback and full study guides.
About the Author
Dr. Margaret ChenMPA, PhD Public Administration
Public Administration Expert & Civil Service Exam Specialist
Harvard Kennedy SchoolDr. Margaret Chen holds a PhD in Public Administration and an MPA from Harvard Kennedy School. With 17 years of federal and state government experience and 8 years of civil service exam preparation coaching, she specializes in helping candidates navigate postal service exams, USPS assessments, government employment tests, and public sector civil service examinations.