My opinion on your latest question, Striker, is find as many groups relating to physics and science in general.
If you can join Science Olymipid, if it is in your school. It is a great competative program for aspiring physics, chemistry, biology, and engineering students.
If your high school only offers 1 or 2 levels of physics, asking your teachers about making a new, independent study class of a higher looks good.
Don't focus in too much on physics or math, from what I have experanced with admissions when I was applying to Ivy league level schools, is they wanted to see fairly well rounded and balenced person. With that in mind, pick up some hobbies, that relate to physics and maybe fun, but to someone in admissions may appear to be something "in addition" to physics.
If you get the oppertunity to take advanced placement, do it. Just taking and passing the class with a strong grade will tell admissions that you are "challenging" yourself. Do note, however, AP classes will not teach you much, aside from passing the test, unless you take advange of all of the resources that the courses make open to you: so read and re-read your book, talk to your teacher about any subjects that you thought were really interesting and see if he/she knows anyone at a local college you could email your questions to (normally do this after the AP test, as most teachers are very much just trying to prep you for that, and then let you coast through the rest of the course with quite abit of slack).
If you have a local college nearby that has a program that let's you attend a course or two for free (or with minimal charge), do it. Getting into the college environment and seeing how things work is a great way to show admissions that you are ready for their school.
That would be my advice, and hey I got into every school I applied to.
