Here are few tips to help you stop hooking the ball:

A player who hooks the ball usually has a downswing path that starts from too far inside the target line and travels through the ball too far outside of the target line.

To cure the hook, the player should concentrate more on trying to swing straight down the target line. In fact, you should actually learn how to cut or slice the ball.

Practice hitting shots with the ball below your feet. This will help change your downswing path from a hooking inside-out swing to a slicing outside-in swing.