Exam quiz is the easiest way to create an exam on your site.
it can provide a way to create an exam by using two content types (exam, question) and store the result on the user side per exam.
You can provide a score per question and specify if this question is multiple or not.
The exam is successfully passed if the user has a score greater than the min score attached to the exam entity.
You can customize the fail & success messages by getting in on the form setting of this module.