How i get better was just play the game for fun, i did not bother about AR,OD,Hp and blah blah. But of course, song category would be by difficulty so that it is easier to navigate through songs. For 1.5 years i did not even know(like legit) what is AR and stuff and continued playing till i actually went to YouTube and found some amazing streamers and when i knew what the options were, i saw that most of the maps i did was AR, 8-9 and was playing about 5 star. That's how i did it and sorry for trashy English. <3