I'm doing my Masters in GRAPPA at University of Amsterdam now and I want to apply to multiple places for PhD after I'm done.
However, the applications in US confuse me. Some say they want GRE scores, some don't and some say it's optional even. And since I'll be applying to some places in Europe as well, I don't want to write GRE and Subject GRE if it isn't that mandatory.
I'm sorry if this might be a duplicate question but any link/explanation would be helpful.