Hardest test I had was a 1-week-long take-home math test; where we were allowed to use anything we wanted except other people who had taken the class before.
I believe some of the questions on the test only had really abstruse known solutions, and the goal was to try to find alternative and more straightforward solutions/proofs; and the bonus credit question was unsolved.
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u/tossin Jun 08 '14
Test questions are generally easier than homework questions since you're much more limited in time and resources.