Hi,
The GMAC tests DO show you your score once you finish the exam, but only on one page right before you get to the review page where you can see what questions you got right/wrong.
Unfortunately, for some reason, GMAC did not build into their software the ability to go back to that score page after getting to the review screen. So for those users that click past the screen too quickly and don't see their score, there isn't a way to go back
However, all of the other 15 tests in your account definitely provide the ability to see your score!