@alexoval:
If your CSU GPA is 2.5, you would need an SAT score of 950 to qualify for the non-impacted CSU campuses for Business which are Bakersfield, Channel Islands, Dominguez Hills, Stanislaus and East Bay as a Freshman.
You should study for the October SAT and aim for at least a 950 or higher.
If you prefer the other CSU’s or UC’s, then going the transfer route is your best course of action and I would apply as a Junior level transfer so a minimum of 2 years at the community college level.