GRE Subject Tests

[Kaz]

... I wouldn't want to take the GRE prior to enrolling only to find out a year or two later it is no longer accepted for credits.

What NAP and TMW2010 said. Also, "grandfathering" under academic policies is the norm. When contacting them be straight-up and say that you'd enroll ASAP if it meant you could "lock in" your policy and guarantee that you could use the GREs. If you couldn't then you'd have to explore other options. Either way, you should get a human on the phone and ask direct questions. The existing, circulating publications and common knowledge are not up to date.