well thats what it means. to complete a study.
it means that in every country actually
True, but I get what Muzzles means.
We tend to use "graduate" to mean finishing a degree course, either at College or University.
Prior to doing a degree at university, meaning while you're at school (or sixth form/college), you're an Undergraduate student, and therefore have never graduated.
You can finish school/college here, but you can't graduate. That simply only happens when you finish a degree at a university or college, since it's a more prestigious and advanced qualification/feat.