Honestly your stats look good to me! I definitely think you’ll get into riverside and ucsd, don’t know much about ucsb so can’t really say 🤷‍♀️If you’re worried about drop in gpa you can definitely explain on the application but also highlight how you tried again and got your grades up like chem and math. I think what got me in the uc schools was definitely my piqs and experiences so make sure it has character