All UC's and Cal Poly

On another note, not sure if this is worth another thread or not.

If I end up applying and only ended up being accepted in a college that wasn’t that high on my list, how hard would it be to transfer from that after 2 years into a better school? Basically, my dad has asked me to ask around if it would be easier to be accepted from a community college after 2 years or a less-prestigious UC. And also, if I transferred, would they still be considering my old SAT/ACT scores by then?

Money isn’t too big of an issue but if they are roughly the same chances I would probably stick with a community college.