How Can I get my College Dreams To Come True?

I am 13 years old and I'm going into 8th grade. I am starting to think what I want to be when I get older and I am torn between being in the medical field or being a lawyer. My mom and grandma are lawyers, and my aunt and uncle are doctors. And my grandpa is a professor and he taught me how I should do my best in school etc. But I would either become a P.I attorney or a Neurosurgeon. My dream is to go to UCLA. I'm torn though. Being a Neurosurgeon, you have a person's life in your hands. And being an attorney, you have to argue and I hate arguing lol. But I need tips so I can get a 4.0 and be offered to go to UCLA on a scholarship! Right now I have a 3.8 GPA. But I still get SOME C's and D's on tests...My mom and dad and basically my whole family says I have to get straight A's from now (8th grade) through the ends of high school to get a scholarship. Is there anything I can do so I can have my dream come true to get a scholarship at UCLA!? I always wanted to live in California and this is my only chance. SO I NEED TIPS TO GET A'S AND HOW TO GET MY SCHOLARSHIP!!!!!! :) Thanks so much!