All questions you use throughout the semester are placed into an Unfiled Questions bank by default. You can see your banks on the Quizzes page by clicking the top-level three-dot menu. You can create new banks and file questions by topic, standard, type, etc.
When you're building a quiz, you can either use Find Questions and pull from a bank or use Question Groups and link each group to pull n-number of questions from a bank. If you want to keep it simple, you can pull all questions, at random, from your unfiled bank without any sorting to give every student a different test on each attempt.
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