So I have a pretty low undergraduate gpa (around a 2.5). And that is my cumulative gpa. In physics I and II and in Gen chem I and II I received C's. Would it help my chances if I retook those classes for admission at a Caribbean school(Specifically the Big 4). Do they average grads or take the most recent grade? Does it matter if I retake those classes at a community college? Thanks for the info!