here are a few links to resources that helped me with Japanese writing, vocab and grammar:
http://www.realkana.com/ (katakana and hiragana)
http://www.wadsworthmedia.com/marketing/sample_chapters/anz/Extra_Teacher_Resources/017012830X_Grammar_Booklet.pdf (vocab and grammar)
http://www.memrise.com/language/eng/jpn/ (remembering kanji, vocab, etc.)
http://kanji.koohii.com/ (remebering the kanji)
http://www.guidetojapanese.org/learn/grammar (help with grammar)
http://gakuu.com/resources/ (all inclusive, plus links to other sites)