What does it mean when people say "competitive high school"?

Applying to College
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<p>My high school =P</p>

<p>Mean SAT score (2007): CR+M 1428, CR+M+W 2139
Mean unweighted GPA: 3.5</p>

<p>12 percent HYPSM (2008)
11 percent HYPSM (2007)
24 percent Ivy League (2008)
21 percent Ivy League (2007) </p>

<p>Who needs APs?</p>