See, there is not a short cut for anything... And we all know "Practice makes men perfect" when you continuously practice your aim automatically improve.... I will tell you the way I used and for me it's the best and easiest way.. First you need to focus on the ball position that where is the ball placed and where you have to pot it (in which pocket) then figure out that where you have to hit the ball that it goes to pocket and then back to your cue ball and then make a shot exact to the place you figure out.