If you could find a job as a technician for the summer or at least clerk in a pharmacy that would probably be wise. Dr. Baron takes into consideration your work experience when assigning rotations and will give you the cooler ones if you've already had retail experience.
I'd start on the 200 drug list that he'll be sending you. Learning them the wknd before the exam is a real bummer, and learning them during the year is no fun, so if you can get them in your head during the summer you'll be sittin very pretty.
Get a good organizer and learn how to keep on top of a zillion diff't things at once, bc that's what you've got coming. It's fun but you gotta learn how to juggle like a circus clown.