All-in-One USPS Postal Exam Test Prep for the 473, 474, 475, 476, 477 Postal Exams, contains questions and answers, tutorial videos, useful articles and flashcards to study. 1 months unlimited access. Don’t take the chance to take the USPS Postal entrance exams unprepared. Get a solid preparation with our test prep and take the exam with confidence! Remember the higher is your score, the more chance you have to be called for an interview. By signing up here, you agree that you are paying a one-time fee to access premium paid content on our website and the fee is non-refundable in case of an early cancellation, and the membership level is non-transferable and not exchangeable.