If a test has 150 questions and you are aiming for a perfect score, you can get a maximum of 0 questions wrong. However, if you are allowed to get some questions wrong and still pass, it depends on the passing criteria set by the test administrator. For example, if the passing score is 70%, you can get up to 45 questions wrong (150 questions * 30% incorrect = 45 questions).
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37 questions wrong gives you a 70.2% correct.
69 questions
Each question is worth 2.5 percent. You can get 8 wrong.
You can get 60 questions wrong and get a 70 percent but if you get 61 wrong you are at a 69.5 percent.
22 questions can be wrong. This means that you would have to get 33 marks, which is 60%