Our community college offers "Dual Credit" classes that you take while you are in High School... instead of Junior and Senior HS English, for example, you take the courses (Composition I and II, and two specific literature courses) though the Community college, taught AT the high school in lieu of taking the Junior and Senior English. The student can also take Government, Economics, and possibly a couple of other courses. I think they could take a maximum of 2 dual credit courses each semester.
Most of the time, these courses do transfer to a typical State University, but many private Universities do not accept them.
My children did go this route. It does help some, but some people say that those freshman classes they are taking early are really a good way to ease into college life. My oldest also took AP Biology, and got a 4 on the exam, which gave her several credits for college.
The best thing to do is to check with the local community college and the High School counselors. They will know what is available in your area.