Cal State Los Angeles, one of the 23 schools in the California State University System, accepts about two-thirds of all students who apply. The bar for admission isn't unreasonably high. In the graph above, the green and blue dots represent accepted students. Most successful applicants had GPAs over 2.6, SAT scores (CR+M+W) of 1300 or higher, and ACT scores of 17 or higher. However, note that there are a few spots of red (rejected students) in the middle of the graph. Some students with grades and test scores on target for CSULA still get rejected.
Unlike the University of California System, the California State University admission process is not holistic. Except for EOP students, applicants do not need to submit letters of recommendation or an application essay, and extracurricular involvement is not part of the standard application. Thus, the reason why an applicant with adequate scores and grades would be rejected tends to come down to a couple factors such as insufficient college preparatory classes or an incomplete application.
To learn more about the California State University at Los Angeles, high school GPAs, SAT scores and ACT scores, these articles can help: