Learning while having fun, without the "feeling of studying"
is what
iknow.jp offers. You can sign up anytime and prepare yourself
gradually day by day for the JLPT, and not just the JLPT,
but for speaking Japanese in real life...
They're having a reduced price promo until December 28, 2014 11:59 Japan time.
Otherwise, you can still get a promo (sign up for 12 months, get 3 months free).
iKnow.jp is a language learning site not just for Japanese but also for Chinese language
learners. You can learn both languages once you sign up.
I've used this for more than a year and highly recommend it.
There's a short trial for you to determine if you like it enough to continue.
You can use the graded vocab lists or make your own lists.
There's an app which you can even use for offline study, and sync again when online...
My favorite feature is the Brainspeed game which lets you pick up on vocabulary
very fast.. It's a timed multiple choice game, which requires you to pick a vocab's correct meaning fast, else it's game over..
Here's my dashboard :)