Yeah I've got that Coroneos one that goes back to 1990.
I also borrowed my teacher's MANSW blue book that had solutions from 1986-1989 I think and copied the 1989 ones.
I think Coroneos also has ones that go back until 1967, but I don't think there any purpose in buying that as the only useful ones would be 1981 and onwards due to syllabus changes although before 1989 there were no graphs or harder 3U I believe. They also took stuff on circles out of conics in 1989.