A chief flight instructor once told us (referring to some of the questionable material we have to know for the ATPL exams i.e. height & direction of a temperature sensor above a grass runway (yes, this question is in there!)) the exam questions should be based upon the knowledge of a current ATPL pilot with 20 years of flying service. I do not know if I totally agree with this, but when I ask one of the LH pilots I sometimes fly (SEP) with about polar stereographic maps, they mostly roll their eyes.