Follow the notes. Get a friend or relative to read the teacher part, and see how well you do. All the time you will be learning key phrases that will help you in your exam. Good luck.
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If you would like to listen to more roleplay examples, make sure you watch the grand compilation here. There is a link in the video description if you would like to download all the scripts. Good luck in your exams and I hope you enjoy speaking Spanish when you get the opportunity. ¡Suerte!