(84 -11)/84 = 73/84 = .87 Grade is an 87, or B+
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0.33% (rounded up from 0.329)
If you mean how to score a test with 12 questions, you take the number correct, divide by 12, and multiply times 100. This will give you the percent correct.
68 right out of 79 is 86 percent. Sounds like a "B."
If you missed out 11 AND got all the rest correct you would have 83.08%. However, if you miss out 11 out of 65 it is unlikely that you are good enough to get all the rest correct!
If each of the 17 questions is worth the same credit, then your score is 35.3% correct, 64.7% incorrect. Each teacher decides what range of scores will get which letter grade, and it might be different on different tests. But it's hard to imagine that your score on this one could get any passing grade.