Hi. One cannot deny that medical is a difficult stream to choose and one generally feels the pressure of the same. While studying we often forget that we need to take small breaks otherwise we reach the point of information overload leading to low concentration and attention. Don't pressurise yourself too much as that would lead to less focus and concentration. Read up about Mindful studying and other good articles available online but I would suggest you to get in touch with a counselor. He or she will help you understand your cognitive functioning and enthrust you with tools and techniques tailored made for you.