The success of a forex trader doesn't matter whether the person involved in trading is a Student or a Business person. It boils down to the amount of time the person has for practice and the level of experience and knowledge of how the market works. The amount invested also determines how much profits could be estimated.
Yes thats righ that anyone can make money in here provided that the knowledge is there. But on the othet hand I see the student having a little limit due to they will be down with the scchool activities.