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.