HELP! Meaning behind request for "Supplemental information application"

<p>i have an sat score of 1400, but my gpa is a 3.91. Im cheer captain, asb, NHS member, and over 220 hours of community service. I dont live my parents, they peaced out when i was little for drugs, i wrote an elaborate essay about my life in my app. I got a supplemental request and now just waiting to hear back. FREAKING OUT. :-S </p>