As your passing skill level off the wall progresses try hitting four different spots in a specific pattern, or change the speed of the passes. If works even better if you have a friend, brother, sister, or parent to pass to but there are no excuses for not spending time to develop your passing if you have a ball and a wall. The Toss-Back machine is a great tool if you or your school have access to this device. In many gyms I've seen this device sitting in a storage room gathering dust. Having good passing fundamentals doesn't necessarily make you a good passer.
Great passers get the ball to the open player closest to the basket.
The closer to the basket the ball is consistently passed, the greater number of high percentage shots a team will get over the course of a game. If your team gets 40 shots in the paint you will likely win most games. Make sure of your passes. This means don't throw a pass you are not sure you can complete. This doesn't mean however to avoid practicing your passing so that the variety of passes you can successfully complete never grows.