Practice. Play maps that you can pass with around 5-20 misses and try to FC them. Also, from time to time play really hard maps (Rains, Overdoses, Deluges etc.).
Focus on the rythm of the song, listen carefully to the beats of the song to know when to dash and stuff. Especially with hyperdashes!! It is handy(Atleast for me) to have the hitsounds louder than the music itself so i know when to dash to other fruits or whatever object you have as your skin.