谁知道留学美国大学心理学系是否要GRE成绩或托福成绩
TOEFL is definitely necessary,, You may take IELTS as an alternative..
they are both language tests..,and you need to prove to the uni that you are able to use english,,
FOR GRE,, it is optional .. but if you want scholarship,, I suggest you take it
Amituofo