Studying for the MCAT is no easy task; it will take time and practice to study for it, both of which you could use to focus on something else before starting your program (vacation, time with friends, family, work, etc.). I've had friends that have taken MCAT prep courses, bought supplementary materials, and hired tutors just to give them a slight edge, and all of which cost money. Taking the MCAT also costs $300+. To some, this might not be much but it's also not cheap. klp2006 pretty much summed it all up and I agree with those statements. Also consider that the responsibilities of both physician and nurse are completely different, different roles, and different interactions with patients. Lastly, the fact that you've already been accepted into a nursing program should be enough to assist in your decision of taking the MCAT. Best of luck in your decision-making. Cheers!