One takes the SAT to get into college, not the TOEFL. The TOEFL is for speakers of english as a second language.
Yes, your senior year here would be validated in the states. It's a myth that only certain schools are "accepted" or "certified" in the states. I know kids from the campo who have never gone to school and when they get to nueva yol get into the system just fine.
The question is, do you really want to miss senior year with the kids you've studied with all these years? Or try to break into a group of kids who have been together for a long time? YOu might feel isolated - senior year is a big deal.