In order to access reports of how children are doing in the quizzes you have set (either separate quizzes or those at the end of the Reading Planet eBooks) you need to go to the reports area of the platform.
Clicking on it will bring up the select groups & filters menu. Here you can choose the group you want to show, the product and any additional information such as the content domains. (For Reading Planet you can choose to view the report by Book Band instead.) Then click select group & filters to see the report.
Once you click 'Select group & filters', the dashboard for the scores will show the following:
You can then choose to view individual pupil progress or export a group report: