Tuned right out of that school life
Soon as reality became a camera crew and a boom mic
The girl in the song may have given up school for the glamorous life.
Boom mics are microphones used on the sets of films and TV shows (often reality shows). Lupe is referring to reality TV shows and how they have replaced actual reality for many.
Taken literally he is saying that she dropped out of school around the time that reality shows came into existence.
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