I am an aspiring Astrophysicist/Astronomer from Omaha, NE and I am competing in the National Science Olympiad in May. I would like to say I have relatively basic-mid level knowledge of the field in for a junior in high school, however I am unaware of the type of questions that will be asked (I am aware of the subject material, but not what the questions will ask for, such as spectrography, solar masses, etc.). I have little resources to perform genuine research as I really rather prefer to do some research by the book, and I cannot seem to find subject material on YouTube easily. I am asking if there are any significantly strong books OR articles that can help me study for the test. I do have a price range of around $50-$60, which really puts a strain on me seeing as how I would like an updated textbook. For those of you who are not aware of the Science Olympiad, it is a national competition for high school students with interests in the sciences and technologies. Usually these tournaments have a wide variety of subjects, ranging from Bridge Building to Anatomy. My first event that I am not taking too terribly seriously is this Saturday at my local zoo, and while I do not expect to place top 3, I hope it will give me an idea of what to expect for my main competition in May. If it helps at all, the subjects for this years Astronomy section is Stellar Evolution and Planet Formation Thanks and cheers!