Pending Availability at Cal Poly Pomona

I got waitlisted in CPP and I accepted it. I know it’s been asked a lot before and it varies on different qualifications, but what are the chances that there would be an open space in Chemical Engineering Major?

And, if ever I don’t get in that major, could I request to be put in my 2nd choice major?

I got accepted in San Jose State University for Chemical Engineering, but my parents don’t really want me to study there because it’s so far. (they don’t trust me lol)