In my experience is good for light to medium study session, not heavier. If I try to do heavy study before the exam, I won't be able to perform well. Looks lik

In my experience is good for light to medium study session, not heavier. If I try to do heavy study before the exam, I won't be able to perform well. Looks like the brain has stamina that will be depleted little by little when used, either during exam or studying.