I have a 3.15 Gpa, however I got a perfect score on my SAT.
All Cal states (exceptSLO) admit by major and Eligibility index.
EI=(CSU GPA X 800) + (SAT math + CR)
If your 3.15 GPA is your CSU GPA, then your EI is 4120. A competitive EI for SDSU is 4100+ so you are on target. Much depends upon your intended major and the stats of the in-coming Freshman class each year.
The perfect score is pretty unlikely, and we don’t know your CSU GPA so, it is a guess but, SDSU is probably not going to come through for you unless you are a local applicant.
Tell us a little more about yourself, your budget and what you want to stud so we can help direct you to some schools from which you are likely to gain admission.