<p>The final calculation of weighted grades is done at the end of the first semester of senior year - for purposes of class rank only, which is the only reason weight matters here anyway - and seniors must sign a paper saying they WILL take the test. So I believe they do weight the senior APs. Also the student must pay in advance for the test.
I don't know if there are any ramifications for those who pay and sign the statement, but then don't take the test, as I have never heard of anyone doing this. </p>
<p>However, as with other schools, the exam grade of course does not figure into the course grade, since, as you point out, it coes back too late.</p>