All undergraduate admissions are handled at the Institute level in the Office of Undergraduate Admissions. All admission decisions for undergraduate students are made in that office.
You should also refer to the College of Architecture's website section for Prospective Undergraduate Students. There you will find information of use to you related directly to the College of Architecture for prospective students.
www.coa.gatech.edu/undergrad/admissions.htm
FAQs for Prospective Undergraduate Students.