Without looking at any of the other answers, here are the things I spotted:
— I would reverse the order of the dates for the first employer listed (so that the most recent one is on top, in line with the other two employers listed). I can’t tell what (500+ hours) means… does it belong to the 2013 dates? Was that for each year? Is it meant to tell me you were full-time? I’m not sure this needs to be there, but if it does, perhaps tweak it.
— All of the descriptions in this section are in first-person, past tense except “Correspondence with…”, so I would change it to something like “Maintained correspondence with…” (or perhaps Sustained, or Kept, or something else).
— If you have any experience with Macs whatsoever, I would add that to your professional skills; your resume is very PC-heavy. That’s not a bad thing, and perhaps your profession is dominated by PCs, but saying that you’ve used both would show that you are versatile and open-minded.
— The Professional Skills are a mixture of nouns and adjectives. I would chose one or the other – my preference would be adjectives, because your second-to- last item (“Self-motivated…”) becomes awkward as a list of nouns.
— High School GPA was 4.¼.0? I’d be surprised if this was a typo, but I expect you’ll get questions about it. :)
— Overused words: you’ve used “excellent” three times, and “utilize” (which is a pet peeve of mine, meaning nothing more than “use”) twice. To remedy this, I would rewrite the Summary as:
“Multi-faceted, efficient, and detail-oriented soon-to-be-college graduate with superlative administration skills, including… ”
… or something.
These are just details… it’s a good resume; the content is solid. I would hire you. :)