My oldest son goes to a high school on the other side of the country. It has an award winning Engineering magnet program. Every year multiple students from this school go to Ivies and other top 25 schools.
Simultaneously, ~55% of the school is poverty level, ~45% is low English proficiency, and about 30% of the students are considered habitually absent (meaning a minimum of 10 _unexcused_ absences).
My son is taking APs, very intensive engineering classes, and participating in multiple extracurricular activities.
In the same school building, more than half of the students regularly rank in less than the 30th percentile on both math and English end of grade tests.
What I commonly hear from teachers and administrators--if you're a teacher teaching classes of the poverty level non-English speakers, what good does it do to fail them? They're just going to drop out anyway. Maybe if you encourage the kids along, a few will get something out of it?
It's an awful situation to be in. The school has at least a dozen ELL teachers. The school offers pretty much all the standard freshman courses (English, US History, etc) in both Spanish and English versions. This drains so many resources from other parts of the school. The arts program operates on a shoestring and all the arts programs are constantly fundraising to keep the lights on.
The soccer team is damn good, though..