http://www.sfsu.edu/future/apply/impacted.html describes SFSU impaction and local area procedures. However, SFSU does not publish past thresholds like SJSU does at http://info.sjsu.edu/static/admission/impaction.html .
You will need to take the SAT and/or ACT (best to do it this school year) so that you can get a more realistic idea of where you stand with respect to various colleges. However, if you have a 3.0 or higher GPA in a-g courses as a California resident, you do not need test scores for applying to non-impacted majors at non-impacted CSU campuses – see http://www.calstate.edu/sas/impactioninfo.shtml for more impaction information.