Difficult - unlike other places, the UC's, which control many of the EM residencies, aren't very cosmopolitan - as a Californian, I'd say they can be surprisingly xenophobic/elitist. Maybe it comes from having the three tier UC/CSU/junior college system, and many immigrants. But if you're interested, you can certainly try, maybe they'll get tired of throwing good people out the front door. 🙂
In EM, I only know of SGU grads at Highland, and SGU and Ross at MLK/Drew, I think. Test scores were high, I'd imagine.