hard work is relative (or relatives are hard work, kidding). I believe if you can honestly tell yourself that that there was nothing more you could have done in any given task, you couldn't have thought harder, worked faster or focussed more intently, then you have worked hard at something.
Another measure could be your level of exhaustion after the task. After an exam I had once (got high marks) I found it very difficult to actually think about anything, i was that mentally drained.
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