uhh... define top notch... i did a pre admission test to architecture and another to "fine arts" and was was given high punctuation on both even if my drawing skills arent what i would call "top notch"... (how i ended on business administration, just dont ask...)
lets say you just need to show you understand volumes and how to draw em... you dont have to be syd mead or feng zhu.. not to enter a school i mean...