Tie college admissions to a random, unique identifier, and make it as blind to subjective opinion as possible. It could go through an intermediary that does have the personal information, but that gives the universities access to that identifier and only non-identifying information. Ask for motivational letters without as little personal information as possible (or no motivational letter at all), no picture, no name, no sex, financial status, nothing that’s identifiable to the people who have to evaluate the candidates.