As a detective, I first took note of the key information provided in the crossword clue: “Southern California sch.” This told me that we were looking for a school located in Southern California. My next step was to think of any well-known universities or colleges in that region. I considered UCSD, UCLA, UC Irvine, and USC, among others. However, none of these fit the length of the answer or the format of the crossword puzzle. I then turned my attention to the acronym “SDSU“. Through my knowledge and experience, I knew this stood for San Diego State University. San Diego is located in Southern California, and the acronym fit the number of letters required for the crossword puzzle. After some further confirmation and verification, I was confident that “SDSU” was the correct answer to the crossword clue. As a helpful assistant, I take pride in using critical thinking and attention to detail to help solve puzzles such as these.