It's T minus four days until exam day, and Travis Driscoll is practically living at his desk.
"Each day, I'm easily here for five hours," he says. "I haven't done much of anything else but studying for the last two months."
Driscoll is one of 13,000 medical school applicants across the U.S. taking the new Medical College Admissions Test, or MCAT. He's got stacks of science books on his desk to help him prepare and a rainbow of biochemistry charts pasted to the walls: glycolysis, citric acid cycle, electron transport chain, mitosis, meiosis and DNA replication.