First off, Kukri is prolly right: growing up, hormonal imbalances, your body needs a lot more minerals, vitamins, and pretty much everything - more than at probably any other period of your life.
You can try some (multi)vitamins; also, lecythin is supposed to help with memory quite a bit, and you can find lecythin pills.
I used to take some myself when I was younger. I can't remember if they helped, though.
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