Stopping on ice got me. No logic to it. All cars stop differently. Just like the stopping distances you have to learn. There isn't any cars being manufactured that take anywhere near as long as they say.
Only 17 and got lucky with a guess on one of those or mine would have been a fail - ice I went 10 times but only as the longest if 20 had been an option I'd have chosen that. However having been driving for 30 years with a clean licence and no accidents I'm ok with that.
My incorrect answers were the colour of 'Cats Eyes', I had no idea and ultimately I guess not that important to know. Turning left into a minor road, I generally am more middle than hard left (unless into a one way) as I want to know what idiot is coming the other way or any obstacles I might encounter before I turn in and finally the one about when not to overtake. The correct answer is a dip in the road, but I wouldn't do it in a 30 unless it was ridiculously slow eg a milk float or in a one way street. In fact unless they're irritatingly slow or on a busier, faster, wider road, I rarely overtake.