No. You won't even see a postal employee at the exam site. They are usually held at exam offices on university campuses.
No, just leave your personal belongings in your car if possible . Some sites have limited space for you to lock up your purse or what not. Also do not take your phone in because it is not allowed.
No not really. I went and took the test wearing flip flops, sunglasses, shorts and a t-shirt and got hired; I also hadn't shaved in like 2 months.
Help job seekers learn about the company by being objective and to the point.
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