Practice ....
First, most everything can be covered in 2 hours of practice.
Just playing games is more of a test of what you have learned.
Practice usually involves the 'parts' that makeup a total game.
Like, shooting different shots and going 3 rails for shape on the next ball.
like putting 2 balls on long rail, shooting the ball closest to corner
pocket, and figuring out how to get shape on the last ball, MORE
THAN 1 WAY. Then try it with 3 balls on long rail, and all the balls
have to go in the same pocket.
Learning how to shoot low follow shots, and where it goes.
Practice various kick shots.
Practice varioius banks shots, 1-4 rails.
Practice long on the end rail cut shots, and get shape on next
ball.
Practice the 'pieces' until you feel good about them, then practice a
whole game, putting them all to work for you. Then get a better player
to watch you, break, and then tell him what your out order is, and why.
Let him then tell you if he would do the same, or different, and why he
would do it different.
You have to crawl before you walk. It has been proven in Scientific
studies that children that walk without learning to crawl first have
trouble with running later on. Children that crawl good before walking
progress faster and better, and have more confidence.
Just food for thought. Good luck with your tournament.