Postal Battery Exam study guide and exam services to sign you up for tests that are in your area, is basically a scam. The assistance number is disconnected as are any phone numbers for the company. The study guide was $129.00, and they told me I didn't wait 12 mths to see if there was a test scheduled in the area, and if there wasn't a test scheduled, I could call them to get my money back. read full review »