A CC graduate with a 3.0 GPA (or close), practically speaking, is not “guaranteed” a seat at their local UC/CSU campus or even guaranteed a seat in either the quarter/semester immediately after their CC graduation. It might take an additional semester or two to successfully gain admission, depending on how many campuses they apply to.
UC does not guarantee an ELC applicant admission to any particular UC campus. ELC admissions are essentially by lottery and these applicants are offered admission to a campus which has room for them in their 1st or 2nd choices of the degree programs they selected on their application.
UC/CSU admissions are essentially a “numbers game” today so your student needs to apply to as many campuses as they are willing to attend IF their HS GPA is at least a 3.0 and they have met all the A-G reqs in HS. If your student qualifies for an application fee waiver … all the better :=)