How UC’s admit:
UCD has no Business Major. They have Managerial Econ found in the College of Agriculture and Environmental Sciences and Environmental Sciences or Econ or Math can be found in the College of Letters and Sciences. Econ is a selective major at UCD.
College of Letters and Science admits by division within the college
• (Humanities, Arts and Cultural Studies; Mathematics and Physical Sciences; Social Sciences)
College of Agricultural and Environmental Sciences admits by college
UCSD has no Business major and Econ is no longer a capped major but Math is a capped major.
The campus does not admit students on the basis of academic major or choice of UC San Diego undergraduate college. Alternate majors are considered and capped majors are highly competitive. Also note: Capped majors require additional pre-req courses and specific GPA to be able to qualify if changing majors. Also if applying to a capped major, select an non-capped major as an alternate.
UCI admits into the University first and then into the major. In the case that UCI is unable to accommodate all qualified applicants in their first-choice major, those students who indicate a valid alternate major may be offered admission in that major or Undeclared.
Change of major information for UCI: https://changeofmajor.uci.edu/school-of-business/
College of Letters and Sciences: Choice of major is not considered in selection to the College of Letters and Science
For UCSB, a student is admitted as a Pre-Econ major.
In order to qualify for admission into the Economics major, students must complete Economics 1, 2, and 10A with a UC grade-point average of 2.85 or above. No grade lower than a C in pre-major courses will be accepted. In addition, students must complete PSTAT 109 or 120A and Math 2A-B or 3A-B or 34A-B with a grade of “C” or higher; the grades in these courses will not be used in computing the pre-major GPA but will apply to the overall major GPA.
SDSU admission rate for Business Admin or Finance is around 35-40% and Econ is around 50%. Mathematics was around 51% admit rate. No data on the average admitted GPA by major unfortunately.
For CSULB, Econ has a slightly lower average admit GPA of 3.85 vs. Business Admin at 3.89. Mathematics had an average admit GPA of 3.96.
SLO’s GPA admit rate is in the above post for Business and Econ had around a 21% admit rate and Business Admin was around 30%, however the # of applicants for Business Admin was 6 times as many as Econ.
For the College of Mathematics and Sciences the admit GPA range is higher: 4.04 – 4.27. Math had around a 28% admit rate.
Due to Covid, there are many factors that will be different in the admission process this year so I would highly recommend he applies widely. I would add CSU Fullerton, Cal Poly Pomona and UC Riverside to the list as more solid Match schools.