Premed at UPenn is very competitive but it undoubtably provides you with top-notch preparation for med school. I know that career services does counseling for premed although I have received mixed reviews about them. However, there are a bunch of premed-oriented groups on campus, most notably PMA...they count as ECs and they basically have upperclassmen who answer your questions and bring in med school counselors & doctors to talk to you.
In terms of premed classes, most of the curves are pretty tough. In orgo, they have a policy that the prof cannot award more than 30% As (A+, A, A-) and that the class must be curved to a B-/C+. For the most part, professors end up giving about 25% As, 35% Bs, and the rest Cs although it definitely varies. I have heard that the curves for introductory bio and chem are equally tough.
However, I don't think the tough curves should deter you from considering pre-med at Penn. The professors are truly amazing and the courses really do prepare you well for med school.