I think OCR definitely prepped us for that paper to balance out its difficulty, for example. Question 7 part 2 was a summations which gave the answer which you had to match, do that correctly and then apply the exact same method to 7 part 3 and you'll get your nice neat answer of 24 (considering you dont make a silly error). That was definitely a given.
Secondly, the integration question indirectly tells you not to split up the integral if you read the next part before attempting the question. I was about to split up the integral but saw the second part which allowed me to realise what the markscheme was after.
Its the little things like these which allowed them to balance the difficulty a bit but it definitely was one of the hardest C2 papers ever.