<p>The Siemens program now recognizes two students in each of 50 states rather than four students in each of six College Board regions. The state awards will be $2000 rather than $3000. The new scheme also appears to recognize physics C mechanics and E&M as separate exams, bringing to eight total number of AP target exams to eight.</p>
<p>It's based on a set of 8 AP math/science tests: Calculus BC, Statistics, Physics C Mechanics, Physics C E&M, Chemistry, Computer Science AB, Environmental Science, and Biology. The award is first determined by the number of 5s among these 8 tests, and then by the actual percentile scores on the tests (to break ties - apparently the College Board has these lying around somewhere, even though we haven't seen them). I had 5s on all 8, although for a lot of states it's probably possible to win with fewer.</p>