Because you want to? Or is this for a class?
Because I want to. AFAIK there are no facilities anywhere near my area offering Japanese language courses, so it's all self-study which is why it's so difficult. My mind tends to wander a lot, but I found that listening to Japanese radio podcasts while drilling kanji, vocab and grammar helps keep me concentrated and it also makes for good listening practice.
I honestly can't say I'm enjoying being confound to my room for such lengths, though. I'm hoping to take the JLPT sometime next year to gauge my progress which is why I've tightened up on my studying so much.
A life goal, probably as well.
Yeah. I'd like to be fluent in Japanese before I turn 30 and become an official old man.