which commitment to drop for accelerated bsn application

Hi there, I am hoping someone can shed some light on a problem I am having with possibly overextending myself with my school, work and volunteer schedule. I am intending on applying to Oregon Health and Sciences University's accelerated bsn program a year from now. In 2010 I graduated with a BA in psychology from Reed college- a relatively tough school with a nerdy reputation :) with a 3.23 gpa. Not great I know, but about average for the school, and keeping in mind there have only been a handful of students that have graduated from reed with a 4.0. And to graduate you have to complete a year long research thesis, so I am hoping that will somewhat distinguish me from the rest of the applicants. Anyway, academically I am working on my prereques and have earned 3 solid A's in a 100 level chem class, A&P1 and micro. (I havent recalculated my gpa). I have ~3 years employment in mental health plus about a year of volunteering with survivors of sexual assault via a hotline and in a hospital setting. In october I became a CNA and have been working 3 days a week for about two months now- swing shift. Here's where the trouble comes in. I want to take A&P2 and nutrition next quarter and I also got a sought after volunteer position as a clinic assistant with a wonderful organization in the area that serves homeless youth. I will be able to learn a ton of really practical information and it is about 7 hours a week. I also need to study this term to take the math placement test to get into Math 111 for the term after next so that I can take a 200 level chem class, to further up my poor gpa. As I said I think I might be overextending myself and I dont want my ambition to work to my disadvantage. I need the job, but I don't know whether to back out of one of my classes for to forego the volunteer position. I guess I am asking if experience or gpa is more important.

Any ideas?

Thank you!!!