<p>W/ Re: to sleeping on the floor, it’s not all that uncomfortable, and sometimes the explore host will have an air mattress available (unlikely though). It’s just one night, not necessarily worth all of the extra effort. Regarding AP tests, most of the credits you get are completely empty, as (depending on your major) you will need to take a full array of classes that are required to graduate. Where they can help is for the ones that can place you into a higher level (B/C Calculus, Chemistry, and some others) or those that satisfy a GE requirement.</p>