Your best best is to study for and take the MCAT either before you get here or right after you're done the SMP. Unless you're amazingly good with your time management it will be very difficult to manage the MCAT workload in addition to your SMP studies. Burnout is also very real, so I wouldn't recommend this course of action to anyone. It seems like a miserable, albeit temporary, experience.
Not to rush you, but are you in a position where you can start studying for it now? You could aim for an early August test date before orientation. Or, this time next year, (Apr-May 2016) you'll be in the last block of grad classes, and that is the only time during the SMP that I can imagine MCAT studying. If you were to start studying in April 2016, you could aim for a June/July 2016 test date and be okay for fall admissions. Either way, give yourself a minimum of 3 months to study, and please don't take it until you're consistently scoring well on practice exams. Best of luck!