As a GRE test-taker, and a postgraduate or a PhD aspirant, the question of what a good GRE score is would have crossed your mind multiple times. Really, how much should you score? Should you aim for a 320+?
A quick and simple answer to the question above is that your target score should depend on the universities to which you are applying. Understand that there is a range of courses available and that the number of universities offering postgraduate and PhD programs has increased multifold, increasing the amount of research that you would need to do pick both the right university and the right course. There is no hard and fast rule that only students who score above 320 get an admit. Your admission depends on a lot of other factors, apart from the GRE score.