Presidential Scholarship/Chemistry

<p>I received an offer to take part in an exam on Mar. 23 with the chance to obtain a scholarship covering my entire tuition. Does anyone know how difficult this test is, or how many people take part? I took honors chemistry my sophomore year and took AP chem my junior year. I'm fairly confident that I could do any high school level chemistry if I review, but I'm unsure as to what to expect.
I'd appreciate anyone's help or advice. Thanks!</p>