This:
www.cambridgeassessment.org.uk/our-research/archives-service/past-exam-material/maths/
An archive of old exam papers -the link is to Maths but other subjects to the left.
As 1984 was two years after I did O-Levels this is particularly interesting for me. The paper did bring back memories of how I could sort of do some of it. (Got a C). I'm amazed at how difficult the 1957 paper is - is it just the different measurements and currency used which makes it seem harder? If noble has time to look at it her perspective would be very interesting.
Should provide plenty of scope for discussion. A-Level and GCSE papers also have links.