From Education Week Online:
Would eradication of standardized admissions tests produce a more ethnically diverse freshman class? Recent evidence from several sources indicates the answer is no. Consider:
University of California studies of high school student records showed that eliminating standardized-test requirements would not increase minority representation. Failure to complete required courses was found to be the main barrier to eligibility for admission in all ethnic groups.
An exceptionally thorough College Board analysis supported the long-standing finding that the SAT tends to predict higher college grades for African-American and Latino students than are actually attained. This result undermines the claim that SAT elimination would promote greater diversity.
Studies confirmed that high school grade point average tends to follow the same ethnic-group patterns as standardized-test scores. Therefore, relying on high school achievement in place of test scores cannot result in a dramatic change.
Let's take a closer look at each of these points.
Would eliminating the SAT foster diversity on California campuses?
In December 1997, the University of California office of the president reported on a study designed to determine the effect of various admissions policies on the rates of "UC eligibility," which is based on the completion of college-preparatory courses, GPA for those courses, and, if the GPA is below 3.3, scores on the SAT or ACT. The data for the study, which were collected by the California Postsecondary Education Commission, came from a random sample of 1996 graduates of California public high schools.
Here's the whole article:
http://www.edweek.org/ew/ewstory.cfm?slug=22zwick.h18
Here's the conclusion of the article:
Individuals of every political stripe agree that, ultimately, we must fix the K-12 "pipeline" (or "river," to adopt the Bowen-Bok metaphor). But this will take years. What can we do in the meantime? The honest and direct way to achieve diversity is by considering an applicant's membership in an underrepresented group to be a "plus" in the admissions process. Eliminating admissions-test requirements as a form of covert affirmative action is not sound policy. Instead, we should focus our efforts on eliminating the legal obstacles to affirmative action programs.