Each card is a typical closed-book exam exercise. Master every card and you have seen every question type the exam can throw at you — just with different numbers (hamburgers, weights, counts), so you drill the method, never the memory.
📝 Real exam: written, closed-book, 6 exercises × 10 points. You need 40 / 60 to pass. Bring a calculator and the provided z- and t-tables.