Yes, I am from the [Insert College], but I think I can offer experience that other students can't. I chose this college mainly because it was in-state and had lower tuition. I've definitely learned a lot and have been stretched far beyond simply the confines of academics by having to support myself through college. I've taken full advantage of all of the academic resources the school has to offer.

Being from a non-core school, I have a bit of a chip on my shoulder. I know I have to prove myself. I intend to use this as motivation to work hard and demonstrate my ability. And also, I know I'm a good analyst. I think my track record speaks for itself, moving from a regional office to the best group at [insert bank].

NOTE: Be careful of how you come off when saying this. Be humble but confident. Speak of your accomplishments specifically, and what makes you a good asset, but don't talk about "how great you are." If you need to illustrate that you have ability, come from an absolute rather than relative place. Say "I am skilled at X" rather than "I am better than almost anyone at X."