Try http://www.tmedwin.net/cbm/selftests/index.htm?words . Each attempt gives 12 Qs, which will randomly show correct or incorrect spelling. You wouldn't want it so that you could just think on a repeat attempt "Oh, I remember this one was correct last time and I got it wrong, so it must be incorrect this time."
Proposed subtle change to how random questions will work in Moodle 2.9
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