Do exam boards intentionally make a significantly harder than usual exam paper for a few units in an exam season?
I ask this because I have encountered my fair share of exams that were significantly different to the trend and difficulty set by the predecessors.
After these encounters, myself and others would link the increase in difficulty to the rumor of 'A level's are becoming harder'. What contradicts this statement is that 1) An abnormally hard edition of a unit's exam is (in my experience) always followed by an average/below-average difficulty edition in the next exam season, almost in an act of compensation from the exam board. 2) I have also encountered easier than average papers when the preceding edition wasn't much harder.
I did not sit any AQA exams, but other TSR users may be able to see what I mean when I mention some of the specific exams:
OCR Maths D1 May 2012
EdExcel 6BIO1 May 2012
OCR Maths S1 Jan 2013
OCR B Physics G494 Jan 2013
OCR A Chem. F325 June 2013 (Absolutely horrid paper, probably blew my decent chance of getting into my firm.)