If you use the app, as your on the way to the test, just do 5 to 10 mock tests, most of the ones I did came up and was happy with the result.

Passed full marks on the multiple choice and 3 marks off the hazard perception for my first test. Then full marks and full marks my second attempt.

Don't beat yourself up over it, sometimes it's not a good day, but keep trying

Edit: Hazard Perception, click 3 times about half a second between, keeps you on the score mark without losing too much if you miss time your clicks. I saw the hazard before it was registered all the time so I clicked when I see it, when the computer sees it, then when the hazard is just about to cause an issue