Quiz issues are rare, and usually caused by users misunderstanding the question, or by the activity being setup incorrectly. The simple rules for minimising issues on quizzes are to make questions understandable and to follow our guides and tips on how to correctly make quizzes. - How to Add a Quiz to a Course
User Not Receiving a Tick
Quizzes will quite often have some questions that require more than one correct answer. This can sometimes throw some users off as they have not read the question fully. Although this is not a very common problem, you are likely to come across it at some point and knowing how to correctly diagnose it is very useful to know for various reasons.
2. How to Diagnose
As this 'issue' is caused by the user incorrectly answering the question, the way to diagnose is through a form of report. This report will show you what score the user has received, and what questions have what scores.
To access this report, as an admin, go to the course page, click on the activity and to the top right of this page; click on the cog dropdown and select 'Results'.