The analyse page (results - analysis), specific the tab 'analyze items', can help you decide if there were any issues in the exam. For example, a lot of students may have had an alternative interpretation for a multiple choice question, and you want to add their choice as a correct option. Or perhaps there was an error in a question and you want to remove it from the exam altogether.
The Analyze items report looks like this:
1. For a specific test moment, click Analyze items. In this tab the detailed information about the items of the test moment is given.
2. Each question is identified by its numeric ID and the code that you entered when you created the question
3. Exclamation marks are displayed next to items the software has identified as potential issues. A tooltip explains the nature of the issue.
4. You can use the interaction analysis to gain more insight in the given answers. Thereby, it is also possible to change the response model.