Haha, well, after naturally rising one day to 7.05, and then dropping, the very next day to 6.4, it prompted me to have a look at the rules that govern the rise and fall of one's Jubility.
I must say that I'm happy with the progress and migration I've made so far. Coming from the iPad after almost 1 year of practice, not forgetting it's my first platform that I played Jubeat on, there's alot to adapt to, and I'm trying to improve my spatial awareness. (more about this in a while)
Anyway, Jubility, simply put, is governed by a function of score and level of song. Each score for each song level has a certain Jubility assigned to it. If your current Jubility is under it, you'll rise by 20% of the difference. If yours is over, you'll drop by 2% of the difference. But if you get SSS and above, you cannot fall in Jubility (this allows pros to play lower level songs for relaxation or whatever they want to play them for, without risking their rank)
Back to Jubeat... I'm sure this is equal to a normal music instrument. Which is why we all keep telling Demel that if he takes up piano, he should be darn good within just a few years.
There's an awareness of the 4x4 squares that you need to build, and this will allow you to hit notes on sight, without over or under shooting (something I keep doing, but now less). This can only be overcome through more practice. No drills can help.
Then knowing how to maneuver your hands across the grid requires practice and studying... no choice lol. There's really not much to say about Jubeat (unless you go into individual songs), accept that it's like every other rhythm game: the more you practice, the better you get.
But one main thing I'm trying to figure out is what's the "duty cycle", or "practice cycle" that is most optimum. Playing continuously tires you out, while resting too long makes your standard dip. So where's the optimum point? This seems to apply anywhere, in anything that requires regular practice to get better, be it body building, to computer gaming. There's also a chance of "injury", like spoiling your technique if you continue to practice while tired. It has happened to me in piano before, so I'm quite aware of such a possibility.
And for the record, I'm back to Gentle Seijin again at around 7.10+, cos I know how to get there. I also managed to get my friend to 8.00+ within one credit. Knowing what to do helps quite a bit.