All I can add by way of reassurance is don't surprised/ worried if you don't finish all/any of the sections. I didn't and worried about quite a bit, but was told at the end of the weekend that it was fine. Indeed my ACA later informed me in the debrief that my score was above average, and I understand many others were in the same boat.
So in short, don't panic. Generally speaking it's testing your 'innate' intelligence. Certainly don't dwell on what you may consider to be a bad performance, letting it affect the rest of the assessments.