This is easy to do.

  1. Visit My Courses:
  2. Find the course where your quiz/test/mock exam was taken (But do not click on the course name)
  3. Click on the down arrow inside the blue circle on the right side as show below.
  4. You will see your previous test/mock attempt and the date/time taken.  Click on the icon to see your details.

See the picture below to help you: