The way I think about them is that I don't think about how the given cube should look as much as how the answers should look. I will look at A first and see if it is possible for it to be the answer. If I find anything wrong I move on and look at B and so on. If I find one that I can't find anything wrong I pick that as my answer and move on to the next problem. This way you don't spend too much time on each problem and instead can spend your time on other problems you are guaranteed to get right if you have enough time (ie hole punching and cube counting).