I am a person who indulges in too much coffee during exam week. That is my one and only way to stay alert and get my notes in my head and on the paper the next day. It works brilliantly and don't start on the too much coffee can kill lecture. I have it under control since I totally detoxify myself once the exams are over.
My only issue was I was constantly broke by the end of semester and getting a decent coffee was difficult. So I invested on a coffee maker when I had more cash to make my life easier. I also make side income by getting coffee for my dorm members during exam week.