The examiner will test every area of the syllabus so you must revise all topics. Selective revision will limit the number of questions that you can answer and reduce your chance of passing. Although the Paper F2 exam does not require you to submit written workings, it is still essential that you practise the steps involved in different techniques. If you are familiar with these steps, you will be more confident about tackling any question on the topic. But do not spend too long on any one topic – it will probably only feature in a few questions.