Hi Chelsea - first congrats on being chosen to take this test.
Let me tell you....my son went to a very preppy school here and the school he attended had the sophomores take the test (all of them) even though it didn't count. Let me tell you that was the best thing they could have done because the more you take it - the more prepared you are and the nerves go away each time you take it. This is such an honor for you Chelsea so take the PSATs as many times as you can. It paid off for my son - he's now an electrical engineer at a very prestigious government contractor in New York State.
Oh - remember the higher the scores you get - the more scholarships and grants you will get when you apply to colleges.