How can I figure out what level I am on?
Perhaps you might consider whether pigeon-holing your level of ability is in any way a good idea to begin with.
..Number one way to get yourself unnecessarily afraid of works you 'think' are to hard, and skimp on great music because you think its too easy.
Incidently, something that wasn't pointed out by J_menz, it also depends whether you operate under the RCM, ABRSM, AMEB, or Trinity.. all of which have similar but slightly different gradings and exam requirements... and of course you may consider the fact that there is far more to be learned from a range of level 'X' music than will be learned simply by meeting the exam requirements at that level.
Infact, my own experience was that I was 'prepared' by a teacher to pass the exam, not to learn the material at all (excusing the fluent performance part, I did that).