Using linked questions, you can create a new quiz based on existing ones and avoid duplicate questions in your academy
You can create such a quiz using the option Linked questions using tags as on the screenshot below
After naming the quiz, click on the Link questions using tags button and select a tag. Then it will be possible to choose the number of questions with the tag that will be displayed to the learners in the quiz
Also, you can add questions that contain several particular tags. So only the questions with both (or more) of these tags will be shown in the quiz