This whole process has been interesting.
If SB becomes a test used for UC college admissions, it will suffer from some of the same issues that ACT and SAT do, including that students from better performing school districts will do better on the test, and that relatively affluent students will be able to prep for the test by paying for private, or group, tutoring. UC schools would also have to adopt separate testing policies for CA private school students (who don’t take SB currently), as well as OOS and International students.
The fact that students will be only able to take the test once will heighten the pressure to do well on the test. It may even become like NY’s SHSAT, where kids study and prep for the test for 1+ years.