Repetition is the mother of all learning. Write the same amount of sentences as you just did in your other dictation exercises. Here are the steps that you need to follow for maximum efficiency:

1. Listen to the audio for 3-5 words or more and then press pause.
2. Write down as many sentences as you can until reaching 15 mistakes. Do not write more.
3. If you can't understand a word, simply leave a gap.
4. After writing, listen to the audio again, fill gaps and correct mistakes.
5. Only then, click the [compare] button and take a good look at your mistakes.
6. Write down the number of your mistakes e.g. in a Google sheet or a piece of paper to keep track of your progress.