<p>A regional rep at a presentation said that major indication for the applicant has no weight to admit/rejection. It only serves as a curiosity point since most Yalies switch majors anyways. Your indicating Arch as a major won’t affect your evaluation. As for subject tests, the page I linked has the information you need. Once enrolled, you take intro classes in the Arch dept. If you perform well enough, you apply as a Sophomore to be admitted to the degree program as a Junior. Arch is one of the more rigorous majors – there’s a 50 max each year.</p>