Earlier quoted context omitted.
That's true for getting into undergraduate programs, but when it comes to graduate programs, dentistry, medical, law schools etc, I believe we still do use the same standardized tests as in the USA.
For grad school, GRE and the other tests exist to filter out obviously unmotivated candidates. So, a good GRE score can not get you in with any certainty, but a bad one can disqualify you.
My recollection of the GMAT's difficulty was that any high school grad with an A average could easily score higher than the 80 percentile on the test. While I was happy my result gave me the ability to choose which business school I wanted to go to (my marks, while not bad, were also nothing to brag about), I also think the GMAT was a useless selection criterion.