There are a lot of players out there that can make shot after shot in practice, but struggle to take and make big shots in a game because of the added pressure. The pressure causes the shooter to second guess themselves because they are not used to shooting with that type of pressure on their shoulders. This is something that a lot of players struggle with, and also why it is important to make sure that you are doing basketball shooting drills that help to simulate this kind of pressure.
The 15 and 3 pressure shooting drill is going to force the player to make shots with pressure on each miss, and the goal of this is to teach the player to be able to make big shots when there is pressure in a game situation. This is a great drill to add to a practice, basketball training, or shooting with a partner.