Nothing can really simulate game pressure, and it is very hard to prepare for shooting a big shot at the end of a game in an empty gym by yourself. However, there are still basketball drills like this one that will help to make you mentally strong, and also help you prove to yourself that you can hit shots even with the pressure on.
You are going to work on your shot and get up a lot of reps, but you are also going to train your mind so that it is no longer a big deal to hit a couple of shots in a row, it is an everyday thing. By penalizing the shooter for missing a shot, you make them have to shoot with pressure. Also, as the time starts running out it adds pressure. Learn how to shoot the basketball under pressure with this basketball shooting drill.