Dinner suggestions near Upper Darby High School
Sycamore and Little Saigon are good choices. Also in that area near Little Saigon is Don Memo for Mexican, another Vietnamese place called Pho and Cafe Anh Hong (which I prefer over Little Saigon), and another Chinese place that sells excellent dumplings (drawing a blank on the name -- next to or one store away from Little Saigon). There is also an H-Mart where all three restaurants are listed, which has quick Korean/Japanese food upstairs.
Hopefully some of these will appeal to you.