Can't Crack Subject Tests

<p>Hey guys! I got an A in honors bio last year and could only manage a 600 on the SAT bio. I just assumed it was a fluke, but I'm currently in AP Chem (getting an A) and still can't seem to break 650 on any SAT chem practice tests. I assumed that if I was ready to take an AP test my SAT score should at least be in the 700s but for some reason this isn't working. Any advice/ideas from people with a similar problem would be great :-S </p>