About this Guide

  • This book is only intended for revision purposes, details are brief and you may need to consult a textbook for more detailed explanations.
  • Remember that some of the topics in Option A require knowledge of the principles in the core syllabus. References to the core guide are given where appropriate.
The following features are also included to help you.

Author's tip
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Hints and tips on how to approach your revision effectively. Exam tips include advice on how to maximise your mark, guard against common misconceptions and avoid making mistakes.

Key information
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Key definitions, formulae, facts and information.

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​​ Worked example
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