In the netherlands it isn't even possible to have a perfect score on every test. Because that is what a 4.0 average says. That you literally got a perfect score on every test you've ever gotten. That means either you are a genius or the test is too easy. I think that if someone actually got 100% on every test of the mandatory 16 courses in high school only on the highest level of education.. probably be national news.
But how do I know for sure? Well, the biggest example I can think of is this: In my country, people are split up from middle school into certain classes. I don't mean classes where there are chairs and such, but classes of people. These classes are divided up by intelligence. After high school you can go three different ways: medium professional education, higher professional education and University level.
Here comes the difference. A Higher professional education graduate, which is a level below University level, can join a masters program in a university in the US, I know this for a fact. However, if the same person wanted to do a University level masters program here, he has to do a 1 or 2 year transition where he receives a large number of courses you need to be able to do and if you fail one you get kicked out.
Those 1 or 2 years show the difference between actual level of education(70% that start it fails) and also shows you guys, if you actually have been getting 4.0 averages, are working way way waaaay below your level.