I am sorry but I cannot answer that question since I do not work in admissions. There is a discussion thread in which a current UCSB engineering student asked to see their application review which gives some insight on the review process. I have linked the discussion thread.
Here is an excerpt of part of that discussion:
- Academic Index – essentially the academic strength of the applicant, calculated from GPA, course load, AP scores, community college classes, rigor, etc.
-calculated via computer algorithms