This is an entirely new question - you really should start a new thread, to stop confusion. If by `abroad' you mean the states, then yes, you'd need to take the GRE. However, you wouldn't need to take it if you were going to, for example, the UK.Given the thread name, I'd like to pose a question here. I'm in my third undergrad year and planning to get my PhD abroad. Do you have ideas on how hard it is, what are good tips regarding that, etc. I know I'd have to take the GRE, but not much beside it.
As for `how hard', I think the best way of putting it is that getting into grad school is `competitive'. If you are better than the other applicants you will get a place with funding, otherwise you might just get a place and no funding, or even just neither. The trick is to be better than the others (or at least persuade your prospective supervisor that you are the best thing since sliced bread and then get them to fight your corner).
(Also, if by `third year' you mean your final year, you should probably get cracking if you are wanting to apply to start after the summer!)