I strongly disagree. I think there are always ways to reason things out. Maybe if you can't come to a definitive answer, I feel that with time on a test, you can atleast eliminate some, and thus increase the odds you will guess correctly. This is one of the reasons why I've never left an exam or test early. Science makes sense and repeats itself, and its your loss if you can't capitalize on that.
I've also always been a strong believer that one can do well in anything they practice in. For this reason I value dedication and hard work, not inherent "smarts." I feel that if one wants to get a high mark in PAT and he/she practices enough, then the high mark will come. It is fatalistic and can only be detrimental to your demeanor and attitude on life to think the way you do. With that being said, I don't consider myself an optimist, usually a pessimist, but this is one value that I will very rarely budge on.
I also believe in n=1 case studies being moot (ie. your personal experience).