which supplement is better for concentration/brain boots and athleticism ?!

Siberian root or Korean ginseng ?
i did some research about both of the supplements but i am wondering witch one is a better supplement from your experience please do tell. I'm starting college and i was considering to get an Aderall prescription because i just cant focus on my work my mind starts to race, random thoughts and so on... so I'm asking this question from some one with experience.