Old quizzes are on their way out, and so I am not sure I would recommend starting out now using old quizzes for a graded quiz. New quizzes are the intended replacement, and so it will be a better use of your time to learn about New Quizzes. However, there are some feeatures missing from New Quizzes right now, including practice quizzes.
I like to assign practice quizzes in old quizzes with question groups set up by topic, and set each group to randomly select about a quarter of the questions in the group. This give the practice quiz a high retake value and still covers all the topics on the quiz. It is also possible to use question banks, but I never found the need because question groups fills that need.
I put my practice quizzes into modules before the graded activities, and use module requirements set to complete activities in order and score at least (the number of puts equal to about 70% of the available points). I find that if students have read the assigned lectures and watched the recorded lectures they finish the practice quiz quickly. For those students who try to skip ahead to assessments without completing learning activities, this design still requires them to look up (and hopefully learn) the information from the learning activities they skipped. As a bonus, I see less effort to cheat on the graded quizzes after students have worked through practice quizzes set up this way.
Cheating is another important topic. I always use a program that limits students to a single window and app while they take graded quizzes. Respondus lockdown browser and proctorio are the most popular. Respondus lockdown browser works well, except that it does not work in chromebooks at all. Proctorio's lockdown browser can be used by students using chromebooks, and the lockdown functions (only) are available in a free version. Proctorio is set up in a way designed to tempt you into using features that will add costs to your quizzes per student, so be careful if your institution does not have a subscription.
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