I am studying at home for N3. I am not very hopeful of passing, but I am studying every day and doing my best.
I am using the following resources:
ANKI.
Shared deck: Japanese Vocabulary for JLPT N3 with Audio
Shared deck: JLPT Kanji-Nihongo somatome text *complete*
Personal deck: peko peko
Personal deck: bikkuri adverbs
I'm finding Anki amazingly effective.
Textbooks.
Nihongo somatome vocab
Nihongo somatome grammar
I also have a couple of drill books with practice questions. If they are in any way representative of the real difficulty level of the exam, I will definitely fail.
I am waiting for the official sample exam papers to arrive from Japan. They are a mixture of real past exam questions and sample questions.
Japanesepod101 (of course)
Just to keep listening to Japanese, I have lessons downloaded on my phone and I listen to them on the way to and from work. Beginner S6, Intermediate S5 and the Advanced audio blogs.
がんばりたいと思います。 いっしょけんめい勉強します。