this is killing me

I'm taking the theory test for my UK driver's license on Friday morning. I've been studying for a couple weeks but now I've gone into high gear (it's been awhile since I had to study for anything!) Here there are two parts; a multiple choice test and hazard perception. I can pass the multiple choice part no problem.

It's the hazard perception that's killing me. I have to watch a series of 14 video clips and identify when hazards develop. That sounds easy enough. You'd hope I can actually notice when something in the road causes me to slow down. The problem is the test itself. If I click to early when the potential hazard has not actually become a hazard yet, I get zero points. If I click to late when the hazard is really obvious I get zero points. If I click too many times the program thinks I am trying to cheat and I get zero points. What am I supposed to do?? So far I've only passed less than 50% of the time. You'd think it is enough for them if I can pass the practical driving test, why do I need to pass a video game version?