@baioslaio:
thats interesting, I'm also aiming for JLPT2 in about 2 years and my current level is propably around yours. Apart from listening, I haven't been in japan, but it's said that in the new jlpt the listening part got easier and the vocabulary and kanji part got harder.
however, I'm also trying to make a good study plan. I already own a lot of books but not all of them are as useful as I thought.
I think I found a good way for kanji. I'm not the Heisig type, so I had to found another way and after testing around I'm working with the
"Basic Kanji Books" right now. Its more repetition at the moment because I already know most kanji, but you have to work more actively with those kanji, so you won't forget them and the words they are used in. After this I go with the "Intermediate Kanji Books" with builds up most of the kanji needed for JLPT2. About half a year before the test I'll probably use "Kanzen Master" for JLPT2.
http://www.amazon.com/Basic-Kanji-Book- ... 850&sr=1-1
http://www.amazon.com/Basic-Kanji-Book- ... pd_sim_b_1
http://www.amazon.com/Intermediate-Kanj ... 824&sr=1-1
http://www.amazon.com/Intermediate-Kanj ... 4893584898
http://www.amazon.com/Kanji-Preparation ... 117&sr=1-6
it's much cheaper if you buy them in japan

And I'd wait with Kanzen Master, because I heard they are bringing up a revised version next year.
for vocabulary:
I don't want to learn stupid jlpt vocabulary lists yet, maybe I'll do it before the test and learn what I missed.
I can recommend the Core 2000 and Core 6000 series on smart.fm. Apart from this I'm just learning whats coming up (in the Jpod101 lessons or other media). I have no masterplan here^^
for grammar:
thats pretty difficult.
I have the series "dictionary of basic/intermediate/advanced grammar" and it's pretty good, but I didn't find the right way to plan the grammar learning right now. At the moment I'm just looking up different phenomens. I'm thinking about going through those books from the beginning to the end, but I'm a bit sceptic, because it's in alphabetical order. maybe someone has a good way here. in a later phase I'll buy the Kanzen Master grammar book but it's not my level yet.
for reading:
well, the only thing you can do is read as much as possible, I guess there is no plan here^^
BTW: the jpod101 jlpt series here is pretty useful, there are a lot of good hints. I hope they'll continuing it.
all in all, I try not to stick to close to those jlpt lists and sites, because it's building up a passive knowledge in my opinion. although I want to pass the jlpt it's more important for me that I learn japanese
for the study time: I use as much as I can spend. Thats about 1 hour up to 4 hours a day, but I'm not only learning, I also do fun stuff like (trying to) read a manga or a website, watching drama or anime etc. this keeps me motivated.