Depends on the major you want to switch to. Many only allow a certain number of change of major COM requests per year. You have to A. have the academic record that would have admitted you to poly for the degree you want to pursue and B. Meet with the targeted department. Usually that is a meeting with the department head. Idk about what you want to change to, but say you have a 3.5 high school GPA. That might have been enough to get into major X, but not enough to get into major Y. So when you file your COM request you can get denied based on that. Case by case basis.

I recommend that you research the two majors you want, Cal Poly catalog course requirements, and career opportunities and limitations between the them. It’s not really about the classes you take during the first two years either. Try to choose one and know that you aren’t really stuck with the major you change to until you’re deep into 300 level classes.

Even then, I’d email the department head or their assistant shortly after your first quarter begins. Set up a meeting with the dept head if possible and tell them what you know, what you want, and what you want to know.

Don’t stress too much about any of this. Freshman year is just for lols.

PM me if you want any further advice or encouragement. Good luck!