For the Trinity Rock and Pop you can choose playback or improvisation for your exam. For the playback you will hear a phrase and then sing it straight back in turn. Listen to the example track and sing along to the guide vocal. For the other tracks there are no guide-vocals.
For the exam you will have two chances:
First time - for practice
Second time - for assessment.
When you are working on your playback skills you should listen to the audio - you can also read the music from the song chart.