I'll add this here as well in light of speaking of regular practice, since it really pertains to the OP about helping in schooling. I remark that when I first started regular practice it felt like my IQ shot up 15 points, and memory has increased, anxieties are largely gone, relationships improve, job performance improves, problem solving becomes instinctive, intuition increases, and the list goes on. Really I attribute it to not becoming smarter, but simply clearing the debris that clouds our minds constantly, and allowing what is there to become what it has been all along. The question shouldn't be how can I get smarter, but rather how do I get to it!
There is nothing but good to be said for meditation, but of course if someone has mental health issues it should be done under advisement or direct guidance. Going into those spaces can confuse someone not prepared to expose the deep in themselves. A lot of cruft surfaces that is normally suppressed and can take some disturbing forms manifest from the subconscious mind. You do need to have a relatively stable psyche to do this. I believe this touches on the "dangers" that were brought up earlier in this thread.