I don't think there is any "get rich quick" scheme for memory in general, or particularly, for this test--that are safe anyway. But keeping yourself healthy thru diet & exercise will keep body & mind at peak performance. There are recent findings that maintaining a diet/exercise plan significantly delays the onset of alzheimers and similar memory loss symptoms. So there is definitely a correlation, which I'm sure is not exclusive to the geriatric crowd.
I, rather stupidly, traded off meals and exercise to gain extra time studying, and now know it bought me nothing.
Also, supposedly this type of work/test burns a ton of brain glucose, so it's good to have a high protein+carb snack every couple of hours.
And guys, adderal and ritllin are effective when prescribed for people diagnosed with ADD, and the the dosages are monitored. Please, please don't experiment with stuff. We're supposed to support each other in this forum, not lead astray.