Admissions Prospects of a rising senior

I am strongly considering a major in economics with a minor in political science and programs like Oxford’s PPE would be ideal. I’m trying to find some scholarships to apply for and I am also considering going to an easier state school where I have a chance for better financial aid. My counsellor told me some safeties for me would Boston University, George Washington University, and American University. Is it worth taking one year in a community college and transferring into a better/reach school, does it help my chances?