I did some of the same with practice quizzes and then a test quiz. The way I accomplished it was to have a bank of questions, four practice quizzes with some random questions and some constant, then opened these quizzes the night before. They had time to practice if they chose and then I took them to the computer lab for the final quiz which counted, which was a random from the entire set of questions. I only opened this one up for a twenty minute period, and allowed them a total of three chances to make their 100%. The only time this would break down is if there is an internet problem. I thought it worked rather well, and the material seemed to be well retained, based on future testing.
Quiz
Testing with "confidence"
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