I have taken one CVSA test and I can't compare it to any other department or place since it has, so far, been my only experience with it. Being that some LEOs don't like people discussing oral board questions or specific things about some confidential stuff, I'm gonna keep this vague.
I was asked a series of questions regarding my background, application, crimes committed, drugs taken, etc. It SHOULD have been only a few minutes, but the machine wasn't booting up. After I was administered the test, I was notified right then and there if I passed (which I did).
Bottom line: BE HONEST.
...and good luck!
Wiggum: Put out an APB on a Uosdwis R. Dewoh. Uh, better start with Greektown.
Friday: That's "Homer J. Simpson", Chief. You're reading it upside down.
Wiggum: Uh, cancel that APB. But, uh, bring back some of them, uh, gyros.
Friday: Uh, Chief? You're talking into your wallet.