I'll catch hell for this but here goes. In the late 80's/early 90's the Feds changed the way semi drivers were licensed. We ALL had to be retested, written only. I was going to have to take the basic test, air brake test, haz mat test, and double trailer test. Yikes! I had an idea. I went to the drivers license office after dark and hit their dumpster. I found stacks of CDL tests that were previously taken AND graded. Questions were computer generated and not all the same, but close enough to figure out their methods. I studied these tests and went and took my tests. I aced all of them. The guy that gave me the tests said he never saw anyone finish the test that fast. Yuk Yuk!
I gave up trucking when my employer went under and ended back in the machine shop. I no longer have a CDL. Gary