Piano Technique Vol.1, consists of 46 exercises, covering two main technical challenges for the piano player: Fingers control, independence, balance & strength Rhythmic subdivisions and essential polyrhythms
Playing the piano requires the use of very fine dexterity. To acquire such skill, the brain must be challenged consistently and repeatedly by the same proposals, causing a self-induced restructuring. This transformation is not a trivial one, and it only comes to be after all the necessary work has been done and enough time has passed.
It's all about consistency and time. Practice consistently and allow enough time for the brain to adjust. Consistency makes the challenges persist, which tells the brain a change is needed in order to solve them. Even when you are resting your brain will assemble new structures to handle those needs that your consistent practice routine has created. Practice every day. It is better to practice 5 minutes every day than 5 hours once a week.