There are demo exams, one demo for each ICDL module. In every demo, the student should get a high grade to prepare him to the real exam. Quizzes are used to prepare the student for the exam too. The students will be able to take the demo exam and the quizzes as many as he like to improve his grade and prepare better for ICDL exams.
Demo exams and quizzes are to help the students before taking ICDL exams, however it will not be considered in the course final grade.