The quizzes in the rest of this topic are designed to help you become familiar with writing full electronic configurations and with using the electrons in boxes notation to describe the arrangement of electrons in atoms.
At this stage the quizzes only consider the first 20 elements (from hydrogen to calcium).
In topic 6 the subject of electronic configurations is re-visited in the context of discussing the properties of the transition metals and the quizzes there cover the first 30 elements (hydrogen to zinc).