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I practice 8 ball, rotation 8 ball (I call it Dakota 8 ball) is the only way I practice. And I am old school, playing someone else is NOT practice, it is a competition. Practice should be by yourself, or with an instructor.
You work on your 'weak points' when practicing, or to fine tune the regular things you come across in competition. You also concentrate on learning what you do not know how to do.
One of my assets I have been told, is my ability to play shape off of any shot. Well, when I learned how to play shape, I shot all kinds of various shots on the table using 12 different types of english for each shot, and watched where the cue ball went after each shot.
Then after that, as suggested, I made a 6" circle out of paper, and laid it down on the table where I wanted the cue ball to be after each shot I shot. Gradually, I learned how to control the cue ball to be where I wanted it to be.
I also had some problems with shooting spot shots. I studied the situation, learned about using the diamond when shooting from the kitchen line, and I shot 200 spot shots in a row one day. I have never had a problem with spot shots since then, 45 years ago.
Another thing that I took up later was shooting 'rolling ball or wing shots' as a little side hobby. This improved my line of sight on shots, and helped establish a 'rhythm' for me when I played normally. I still do this sometimes as a 'fine tuning' tool for my playing.
When I warm up for a tournament, which isn't too often anymore, I shoot some various shots, but then I concentrate on 'bank shots', all kinds of bank shots. It brings my aiming to where I want it to be, and gives me that 'lean green mean' machine feel.