Cal State Channel Islands, one of the 23 schools in the California State University System, accepts about two-thirds of its applicants. Using the graph above, you can get a sense of your chances of being admitted. The green and blue dots represent accepted students. The majority of students who got in had averages in the "B" range or higher, SAT scores (CR+M+W) of 1350 or higher, and ACT scores of 18 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 CSUCI 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 issues such as insufficient college preparatory classes, an incomplete application, or some other disqualifying factor.
To learn more about the California State University at Channel Islands, high school GPAs, SAT scores and ACT scores, these articles can help: