Yeah, we do know you can develop your brain through mental activity; in a similar way to how you develop your muscles through weight training. Even knowing physical exorcise can improve muscle function, you wouldn't do bench presses to train for a race. You might supplement your training routine with some leg exorcises, but you would want to understand everything in the context of the goals you're trying to achieve. While I think we can develop better brain training exorcises, I don't think developing artificial drills is the most important part. Understanding how the brain develops and responds to the demands placed upon it will involve some far reaching consequences. You could develop some computer games to help with things like mental concentration, spatial reasoning, numeric reasoning and so on. But you'd also want to incorporate anything relevant into the actual lessons and study habits taught to the students. If nothing else, the understanding that you can build your brain like a muscle should provide encouragement for those struggling with things they feel they can't do.