Hi,
I have done this exam in the context of the
ICED certification.
Since it is not a certification by it's own,
I'd suggest not to do it if you want to get
certified on in OOAD. However, the material
it covers is very important and interesting.
So if you're like many of us that for studying
need an adrenaline
boost, such as the one a
tight deadline of exam date offers

, then
I'd do it.
Cheers,
Gian