I may be misremembering, but I think we had simple topology, linear programming (mainly just 2D, but I remember a 5D problem at the end of the section), matrices with eigenvalues and eigenvectors, set theory, and a bit of group theory. No programming, though there was some in the text book. It was pretty good fun. I don't remember anyone finding it conceptually difficult.
It would also be worth mentioning Nuffield Physics. I thought that was a really great course for learning how to do physics. Very oriented towards finding solutions, devising experiments.
School Mathematics Project covered secondary school, and was very much part of the New Maths project. And yes, we did cover set theory in primary school.
It would also be worth mentioning Nuffield Physics. I thought that was a really great course for learning how to do physics. Very oriented towards finding solutions, devising experiments.