I would say a 650 or above for both Vanderbilt general admittance and for the Villanova fellowship. You have some work experience which is really nice and your UG school is good. I think you'd be fine as you are right now for Nova, but not the fellowship.
As far as calc requirements, they might wave it, but it would benefit you to know it. We used a good amount of calc and stats when I went to Nova.
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