A quiz consists of up to 10 questions taken from a particular lesson, and is the main way in which Lingopolo teaches you the words and phrases. Each question in the quiz is scored either right or wrong.
For example, in the lesson on animals, there are currently 20 words. A quiz will ask you 10 questions, using some of these 20 words. Depending on how much you have already studied this lesson, and whether you keep getting the words correct or not, the ten questions may be ten different words from this lesson, or, more likely (if you are getting words wrong), a smaller number of words with some of those that you get wrong repeated.
At the end of the quiz, you will be shown your results for the quiz.