With a 3.5 HS GPA, Stanford, Caltech, UCB, and UCLA are unrealistic reaches.
UC Merced, UC Riverside, and non-impacted CSUs would be more realistic for admission.
However, if your worse grades were in 9th grade, then your HS GPA as recalculated for UCs and most CSUs could be better, because the recalculation uses grades from 10th and 11th grades courses.