To succeed in college requires 12 years of training in a good elementary school up through high school. A good education leaves you with the ability to read, write, form an opinion, present that opinion as an argument, seek new info and test the validity of new data. A good education up to high school also teaches good study skills, discipline, setting goals, and performing tasks in order.
If you go to a shit school district, odds are that you are not going to get this root set of skills. Even if you make it to a college, you will fall behind the other kids that did go to good schools. This is why there are remedial math, English, reading and writing classes for kids that need to get caught up.
I will leave it to the reader to make guesses on the socioeconomic status of the kids in good schools versus poor schools.