It looks like the questions are always in the same order. Random would be a step up, but using a proper spaced repitition algorithm would be best.
http://en.wikipedia.org/wiki/Spaced_repetition http://en.wikipedia.org/wiki/Leitner_system
http://en.wikipedia.org/wiki/Spaced_repetition http://en.wikipedia.org/wiki/Leitner_system