The best volleyball passing drills involve receiving a ball across the net. Partner pepper drills and other drills that don't involve a net aren't game-like.
It's extremely important for passing drills to be game-like.
Moving to Pass a Volleyball
To be good at passing, the players must be good at anticipating the opponent.
In serve receive, you must be good at reading the server and flight of the ball. Communication with teammates is critical.
The earlier you can decide who takes the ball, the easier it is to make the pass. Most often a teams serve receive breaks down because of poor communication.
For defense, reading the opponent is critical. Your team needs to read the play that's unfolding on the other side of the net. Great defensive teams are great at reading what's happening. The better you read, the easier it is to get in position to make the play.
Every player needs to spend time developing skills for passing. Specific movement skills for moving forward, backward, and passing the ball off-line are important skills to master.
Volleyball Passing Skills
The best passing drills involve receiving a served ball or defending an opponents attack.
The key is the skill before the skill.
You don't want to spend time passing a ball that isn't game-like. For example, passing a ball that's being tossed. There isn't anticipation involved in reading a tosser.
To become great at passing, you need to be receiving a game-like ball. Partner pepper passing drills won't make you a great passer.
Partner pepper drills aren't game-like. The anticipation for these drills is completely different and not what happens in a game.
Athletic Volleyball Players
What you need: A box, 2 passers, a target, two shaggers, a ball cart, and a server/coach.
Have a coach or player stand on a box just inside the endline. Two players stand in serve receive on the other side of the net. The coach serves to the passers.
The purpose: By standing on a box, it's easier for the coach to be more accurate placing the ball. It's also harder to react to the ball because the ball is coming faster. Use different types of serves such as floaters and topspin.
Variation: The coach can change the difficulty of the drill by making it more difficult or easier to pass. Force the passers to communication. Also, force the passers to use specific movement patterns such as moving forward or moving backward to pass the ball.
The Goal: Set a goal for how many consecutive passes. Or set a goal for so many good passes in two minutes. For example, must have 10 perfect passes in two minutes.