Thanks for the advice and support everyone! Just wondering, when answering questions, are you assuming they are well acquainted with your application (like things you said in your essays) so you don't have to repeat things over again/so you can refer back to it?
It depends on your interviewers. Since this is an open filed interview, they will have a chance to review your application beforehand. Some do more than others. Just know what you wrote on your application.
During my interview, they asked me specific questions concerning my application.
Good luck!