Dont forget! If you are planning to do JLPT this year, application deadline is 28 April!
You can apply here:
Few sites to help with preparations:
http://www.tanos.co.uk/jlpt/jlpt4/
http://www.jlptstudy.com/N4/
http://jlptbootcamp.com/2012/11/the-official-jlpt-n4-practice-workbook/
http://www.mlcjapanese.co.jp/Download.htm
http://www.nihongo-pro.com/quiz/60b9d732ca/learn-jlpt-n4-grammar-choose-the-correct-word-order
http://www.jlptstudy.net/N4/N4_kanji.html
http://en.wikibooks.org/wiki/JLPT_Guide/JLPT_N4_Grammar