How to improve my chances for FMF Corpsman?

I'm in DEP program for the Navy. My MOS is HM i was a little unsure about doing FMF but after talking to a fellow corpsman when he was on RASP duty or RAP duty im not really sure how to say it or spell it :) but after talking to him i realized that this what i want to do. I workout 4 days a week and i look up information constantly aboout my job plus its training. Is there anything else i can do before i leave to really make sure i get this job.