<p>"If he goes ahead and reserves a test date in May or June for the SAT, will that be too much for him if he is already scheduled for 4 or 5 AP exams at that time and 2 SAT subject tests as well?"</p>
<p>I don't think it makes much difference. You just go into - it's yet another test mode. My son took the SAT1 in May right after taking a bunch of APs. Most of his friends took the SAT2s then with the advantage of AP review. The only reason mine didn't was that he knew he was going to have to learn a bunch of physics that wasn't included in his AP Physics course. It also helped that he was still reviewing American History in June for the Regents test so he was in good shape there - didn't have a month to forget US history! He forgot to take Math2 when he should have but we didn't find it hurt to have waited the extra year. (He took it after Calculus instead of Pre-calc.) The whole point of taking APs and SAT2s back to back is you can usually do almost no extra studying for the SAT2s.</p>