SDSU is an impacted campus meaning that all majors have more applicants than spots available including Undeclared. Also you enter SDSU as a Pre-major and have to maintain a specific GPA (varies by major) to continue into the upper division courses. I will give you a link and you can calculate the acceptance rates by major based on 2015 data. Most majors have around a 30-40% acceptance rate with the lowest being Nursing which is around 5%. Also do not count on switching majors easily at all the CSU’s. Many of the impacted majors/competitive majors have higher requirements.