<p>Sports stores and stores like Target sell roll up foam camping sleeping pads for about $20, and self-inflating pads for about $30. My kid was lucky to have a mattress to sleep on at Explore, but has survived on dorm floors in a sleeping bag elsewhere, no problems, it probably depends on the kid and the flooring.</p>
<p>I don’t know the details of AP testing or graduating early, but several of my kid’s friends will graduate after 3 years or with a Masters after 4 at least in part due to AP credits.</p>