The MCAT is administered at the same local time. There are different forms of the test. There is nothing to stop someone in New York from calling up someone in Hawaii regarding what is on the test, however the person in New York will not have a break until around 12:00 for lunch. At that time, the Hawaiin will just be entering the test. Even if they could possibly somehow contact each other in time, the amount of information that the Hawaiin could learn would be minimal.