My step-daughter was literally math-illiterate upon entering college - very poor math SATs, couldn't multiply 1-digit numbers without a calculator, and didn't know that a+b commutes but a-b doesn't. I spent several hours a day 3-4 days a week with her, and through tremendous effort and lots of tears she earned all A's in Calculus 1 and 2 and Statistics. There is simply no way she could have even passed without my help (and a boost of self-motivation by a short stint in the real world earning near minimum wage with no college degree and no future).
Rich people will hire tutors to do the same thing. Poor people can't afford to and rarely have anyone like me around to help. So the rich will get ahead regardless of ability; other than a few exceptionally talented ones, the poor will get further behind, continuing the cycle of failure and poverty.
There is something about individual interaction that can't be duplicated with a computer or projection screen. A 50-to-1 student/teacher ratio with little individual one-on-one instruction is going to make things much worse.