Plunko is a game of luck; you can't predict where the ball will fall. No matter how hard you try to study and understand the game, you will also end up getting disappointed. Sometimes when I'm trying my luck, it's even as if you should try turning my phone screen to see if the ball can be controlled, but it's totally out of it. 
 
The only way that we can manage to win something from plinko is to reduce the amount we wager on each bet so as to use a small amount to increase the number of times we can place a bet with it; that way we can increase our chance of winning.