Without more context, we don't know whether the speakers played in the match or took the exam.
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tenjingIf I am not correctYour sentences are correct English. Your questions are too confusingly phrased for me to be sure what you are asking or whether you have mistyped something.
tenjingDoes it mean I didn't pass the exam because I didn't take it. If I had taken the exam I wouldn't have passed it.I still find this still confusing. The expected corollary to "I didn't pass the exam because I didn't take it" is "If I had taken the exam I would/might have passed it".
tenjingYou did very well to pass the exam. I am sure I couldn't have passed it.I would generally take this to mean I did not take the exam, but if I had taken it I would not have been able to pass it. However, the sentence does not rule out the possibility that the speaker tried and failed, it's just that if this were the case the speaker would p
tenjingYou did very well to pass the exam. I am sure I couldn't have passed it.That makes sense to me.