This practice set mixes every skill from the unit on data you haven't seen: totals and differences, percentage change and growth, shares, ratios, averages, and pie charts against a stated total. The sets get longer and the clocks get tighter as you go.
Each set draws a new dataset when you retake it, so treat a miss as a reason to go again. In the review after each set, read the "likely slip" notes: most wrong answers come from the same three or four habits.