Your school already failed you
Additionally, school might have have failed you in the sense that success in it won’t actually prepare you for success in life.
Ali plays with the phrase “already failed you”, because the point in school is to not fail.
Lupe Fiasco voiced a similar opinion in American Terrorist III
This line could also refer to the tendency of teachers to grade students based on preconceptions. If a student is perceived to have a disreputable appearance or insubordinate attitude, she will be judged more harshly than a clean-cut, soft-spoken kid, regardless of actual quality of work
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