Basically, on the revision CD, you are told to click once when you see a hazard, you've got 5 seconds to click when a hazard appears.
However, the test, you have to click 3 times, when you see a hazard, when it develops, and when it changes, and i was like, "what the f**k" and didn't have a clue what to do.
Talking to my freinds though, i know understand, when you see a hazard, simply click 3 times in even intervals, like every 1 second after you see the hazard. To fail a clip you need to fill the whole of the screen with flags, which is like 15 clicks, so its ok.
Get the CD though, i would of 100% failed my theory without the CD.