I think I read about GABA to improve memory. It has been mentioned often in different threads. Just type GABA in the search all curezone space and see what comes up.
One thing is you would take before going to sleep, since it will make you sleepy. I guess the brain needs rest to put it to use? Don't know the details but makes sense.
So study, then take, then sleep....Uh and they recommend no driving after taking it of course.