What are the requirements for a CSU college?

i cannot afford a UC college and i plan on becoming a math major, and i can earn my degree there and the CSU is closer to home. I could aim higher but I dont think I will be able to make it that far with my grade because the UC is harder to get into. I work too hard as it is and I have a 3.4gpa. and i dont like extra curricular activites, so what can i do?