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

Applying to College
35

<p>My high school =P</p>

<p>Mean SAT score (2007): CR+M 1000, CR+M+W 1500
Mean unweighted GPA: 2.8</p>

<p>0.5 percent HYPSM (2008)
0.5 percent HYPSM (2007)
1 percent Ivy League (2008)
1 percent Ivy League (2007) </p>

<p>I go to a poor, cheap, and underperforming HS. Woe is me.</p>