Buzzer & Brain Training
You can't earn points if you don't know the answer, so knowledge acquisition through repetitive drilling is the best way to condition your players.
But, there are other types of training that can help give you an edge.
First and foremost is reaction-time training.
Here's an app to test your reaction time. Pressing the lockout button immediately after the red signal lights up is an invaluable gameplay skill. Try using this reaction time test to improve player response times.
The Online Reaction Time Test, © 2002 by Jim Allen, gywh.com
Not every player has the same training needs, but all can be aided by focusing on skills that enhance performance:
Memory - Attention - Speed - Flexibility - Problem Solving
Check out these sites for personalized brain training assessment and exercises: