Choose a part below: a revision sheet (reminders, worked examples, classical pitfalls and illustrations) appears at the top; you can fold it if you prefer to test yourself first. Then answer each question (multiple choice with a single correct answer, or a numerical value to fill in) and click Check: the page tells you immediately whether your answer is correct and, if not, shows the expected answer with its justification. For numerical answers, a dot or a comma are both accepted as decimal separator, and an approximate value within the rounding stated in the question is accepted. Use Try again to redo a question, or the Reset this part button to start a whole part again. Each part keeps its own score.