Someone gave us this link a month or two ago (sorry whoever it was, I don't remember ^^; ) that you may be interested in using.
Yahoo! You'll probably want to use 国語(こくご) to practice your Japanese, but you can also try the other subjects to test yourself outside of just a language context. It's obviously not the JLPT but it's intended for kids from beginning school up through middle school in Japan. Definitely start from the beginning grades and work your way up. I overestimated my vocabulary the first time I tried it, so it was a little disheartening having to check the dictionary so often for stuff that was 'only elementary school level'. I just thought you might be interested in the link because MMM mentioned that JLPT 1 is sort of the equivalent of saying 'I can write at a 1st grade level!' Hope you get some use out of it
