Hi,
I'm not sure if you're using the same test software I used when practicing for mine but I didn't rely on the score the program gave me.
For example, let's say image 1 on the program, there was traffic lights and motorbikes. If you missed either of them or said there was anything extra like pedestrians, the program would score you 0 for that image even though you might have identified one of the things correctly (does that make sense?).
Instead, what I did to work out my "true" score was added up everything that was shown across all 10 images and added up everything I correctly identified across all 10 images. E.g I spotted 27 of the 5 things to look for across the 10 images but there was 30 things in total across the 10 images. So my score would be 27/30 = 90%. Let's say the 5 things I missed were spread across separate images, the program would have marked me down as 0% for 5 images, giving me a score of 50% (which was disheartening when I was practicing). Hope this makes sense?
It goes without saying though and it's my one piece of advice with the ATAVT test: Unless you definitely saw the object in the picture, don't tick it. Helped me think I was being negatively marked down for saying something was in the picture when it wasn't there.