You are free to take the exam as many times as you like. However, once you start an exam, you will have 20 minutes to complete it in full-screen mode. If a popup or another window takes you out of the exam, the questions are covered and the timer pauses. You have 5 seconds to return. You can return twice. If you stay away, or leave a third time, the exam is submitted.
You have to score more than 50% of this exam to unlock the next chapter.
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