As of the July 2012 JLPT, participants are able to check their scores online BEFORE official results are mailed out to test takers. If you have a copy of your application form & the password you chose during application you can check your score on the official JLPT website. Results will be available online as of September 3rd (official scores will be mailed out to test takers in early October).
Please check online at: https://www.jlpt-overseas.jp/onlineresults/top.html