The Past Perfect makes sense. It suggests to me that the possible failure was before 'he thought'.
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CliveNo-one is likely to think that you can fail an exam before you take it!Yeah, without a doubt. I only meant that both grammar and common sense should support the same interpretation...
CliveYes, your new sentence is clearer, but the original is more common and more natural English.This is interesting
CliveI see failure as being at 3pm.Hmmm, I interpreted 'he thought he would fail' as the past version of 'he thinks he will fail'. Thus, failure at 9 pm when the results are known.
CliveWhat difference.do you see? Are you talking about a high mark versus a barely adequate mark?