The ETHS server housing Moodle has been down since Thursday, and is still not fixed. We do not have access to AP exams and solutions. Here is another site that has EM exams up to 2002, with solutions. After 2002, there are only mechanics exams.
For 2002 to 2012, the College Board has the free response problems and solution keys, as well. Check here!
I hope this helps a bit. Many thanks to Erin R. for finding it!!