Soooo, spoke to the college counselor and got a few answers. There are no longer subject tests for the SAT. Just the regular math and verbal parts.
The chemistry thing is a kick where it hurts though. She didn't realize (or forgot) he hasn't taken it. She sat with MIT and CalTech (and Harvey Mudd, GA Tech, etc.) and they will all require him to have completed AP Chemistry, the highest offered at his school. So they are now scrambling to change his schedule and get him into the Chemistry Honors class so that he can take AP Chemistry next year.