Official GRE General Test score reports not more than five years old must be submitted to GIAC. Our program does not require additional subject exams. We do not have minimum score requirements.
As long as you have taken the GRE by the December 1st deadline and asked ETS to report your scores to UT Austin, they should arrive in time for review of your portfolio.
The UT Institution code is 6882; there is no need to enter a departmental code. If you are applying to multiple UT graduate programs, you need only submit your GRE scores once.
For general information on the GRE exams, see http://www.gre.org