Take this free practice test to see how prepared you are for the United States Postal Service Exam 474, 475, 476 and 477 for mail carriers, mail handlers, mail processors and customer service postal clerks. The test covers such subjects as Work Scenarios, Describe Your Approach, Tell Us Your Story, Check for Errors and Money Change. Please note, Work Scenarios, Describe Your Approach and Tell Us Your Story are used by the Postal Service like a personality test to understand the test-taker and do not have right or wrong answers.