How is the series organised?

Phase 1 covers Paper 1 foundations (Tests 1 to 5), Phase 2 covers institutions and dynamics (Tests 6 to 8) and the Integration Phase pairs both papers (Tests 9 to 11). Test 12 is the mid-point benchmark, Phase 3 covers Paper 2 (Tests 13 to 16), and Phase 4 is the final simulation (Tests 17 to 20).