Hi @steinert in my testing, if you indicate in the quiz that students can see their responses but not the correct answers until a particular time, they can see what they entered for the question and if it is correct or incorrect. This obviously gives the student a bit of information about what the correct response may be. You can indicate to not allow students to see their responses in which case no information about what they entered or the correct/incorrect answer is available after the quiz, and then go back and change the settings later.
In New Quizzes you have a few more options as to what students see when they submit a quiz (see below). While there is no "practice" quiz setting in New Quizzes, you can indicate that the assignment does not count toward their final grade, have in placed in an assignment group that is worth 0% of the final grade, or it appears just make the point value of the assignment overall 0.
Does this help?

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