Did you know that there is an omega 3 fatty acid called docosahexanoic acid (DHA) that contributes to maintenance of normal brain function, no? Well optimal nutrition is key to a healthy mind, which is important to know if you are studying. To ensure optimal nutrition try a good quality daily multivitamin and some omega 3. And around exams you could also try some theanine, it's a natural supplement from green tea that is popular with students