Definitely. Despite having a middling sci GPA I got into two great schools and went to a bunch of other great schools for interviews. They will not hold your hand like Bryn-Mawr will, nor is it a virtual guarantee you will get in. But the sponsoree acceptance rate is consistently in the 90-95 percent range, which I felt very comfortable with. I didn't think it was that hard to get sponsorship, as the requirement for me was just above a 3.0 (it varies student-to-student). However, I'd recommend that you shoot for a BCPM of
at least a 3.3 or 3.5, because I know I was screened out by a lot of schools for being a low 3.
In HCP, I was kind of my own worst enemy: I tried to work full-time at a high-pressure job while doing two hard sciences. It did not work out very well, but I eventually quit the job to go back to HCP for some upper electives and got into a MD program that is a great fit for me. There is an issue of sticktuitiveness at the HCP, as a lot of people drop out because they decide they don't want to do medicine or whatever. Honestly, getting sponsorship is a function of: 1) getting decent/good grades in your sciences; 2) turning in your sponsorship form as soon as possible; and 3) turning in your personal inventory essays, etc. as soon as possible (at the beginning of your application year). None of these were hard tasks. I think part of the game is being conscientious and good with deadlines, paperwork, and being organized.
I suggest investing in Google Calendar and setting it to text/e-mail you for important dates and meetings, as they will often occur for the next 2-3 years.
I guess my strongest advice is to volunteer or research lightly (~5-10 hrs a week, with a proviso to slow down during exams), make sure that if you are spending your time there you are not just a gopher but actually doing some leadership or accumulating great stories of working with patients. For me, I got to combine research with clinical experiences at Children's Hospital Boston. I got to work with cute babies all day and then study their brain EEGs. Try to seek out research advisors who are nurturing in your goal towards medical school. Mine guided me towards a poster that I eventually presented at a national neurology conference. Again, self-starting is important at Harvard University.
Http://hms.harvard.edu is your friend, find amazing profs that you would like to work with here (only if you have the time). The most important thing is getting used to the sciences, however, so I would put the extracurricular stuff until you feel you have some extra time.
If you do community work, make sure it fits into YOUR story. For me, I was a creative writing major, and so I sought out a youth outreach creative writing program in Boston, where I eventually became the coordinator for a year. If you like kids, do pediatric research, not centenarian research. Make sure you are consistent. As the great bard said, to thine own self be true...and thou canst be false to any medical school.