Science GPA vs Overall GPA for premed

I have a very bad science GPA, and I have about 4-5 pre-req for life science major at ucla. Should I do psychobiology, since I heard the classes were easier and it may boost my overall GPA, however, it won’t count toward my science GPA. Or should I do like a molecular, cell, development, biology major where its all science class but harder than psychobiology. Overall, would it be weird if I do psychobio and get a decent overall GPA, but not so well science GPA? Maybe I can so psychobiology and do a post -bac program after I graduate?