What does undergraduate, graduate and postgraduate mean?
undergraduate is like being in high school?
in which level do you do your major?
postgraduate is like a master's degree?

I don't understand :( In Mexico, after highschool, we do our major (4 to 5 years) and then, if we want, we do our master's degree, then the phD (except in the case of medicine school)

Question

What does undergraduate, graduate and postgraduate mean?
undergraduate is like being in high school?
in which level do you do your major?
postgraduate is like a master's degree?

I don't understand :( In Mexico, after highschool, we do our major (4 to 5 years) and then, if we want, we do our master's degree, then the phD (except in the case of medicine school)

Answer

Don't be so modest, Elizabeth, you're very close. "Undergraduate" means in college (en la universidad), working on your major. Graduate means you have graduated from college (ie university degree) and may or may not be continuing your education. Postgraduate means that you're pursuing a master's or doctorate (or equivalent). I've never heard "undergraduate" or "postgraduate" applied to high school, however, the term "high school graduate" is used to indicate someone with a high school diploma (and no higher degree).

Answer

In general, I think it is like this:
* Undergraduate (BS / BA - College)
* Graduate (Masters, PhD)

* Postgraduate (This can be ambiguous.  It could mean, "after graduation" which means the same as "graduate" above.  It could also mean post-graduate work, which could mean you already have a PhD and you're doing further research "post-doctorate research")

http://en.wikipedia.org/wiki/Postgraduate_education

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