People just memorize it, then forget it as soon as they walk out the door with the written report. Sure some study and understand the material, but these tests are outdated. The real knowledge test is that few hours you spend with a DE, if you can't convince him then maybe you shouldn't be "at the controls"... but you guys sure put a lot of faith in a knowledge test with outdated questions, and multiple published banks of answers.
Before everyone jumps me, I do think you can eek out a 70% on the tests pretty easily...yeah you are a lazy bastard and probably not cut out for it if you find it impossible dedicate a few days to "studying".... But it's also a joke that someone can study for 2 days memorizing everything...little to no comprehension and get above 80% then forget 90% of it a day later.
I just think the whole concept is flawed and outdated, I mean really... they have computer software that just shows you the correct question so you can cram and just remember where (not even what the answer itself, the location among the answers) on the test (top, middle, bottom) I was studying with some people who didn't even read beyond the first few words of a question but already knew the "middle one" was right. How does that help anyone?
If you wanted to make these tests legit, mix up the question banks. Update it, don't publish everything... just release a few sample questions for each subject and force people to understand what they are clicking on. And randomly swap the order of the answers on the test.